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Structure of a human cell
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Anatomy & Physiology Slides

  1. 1. Nursing Review of Anatomy and Physiology Review for Philippine Nursing Licensure Examination
  2. 3. Outline of Selected Topics in Anatomy and Physiology <ul><li>The Cell </li></ul><ul><li>Integumentary </li></ul><ul><li>Musculoskeletal </li></ul><ul><li>Nervous </li></ul><ul><li>Endocrine </li></ul><ul><li>Cardiovascular and Hematologic </li></ul><ul><li>Gastrointestinal </li></ul><ul><li>Urinary/Fluids and Electrolytes </li></ul><ul><li>Reproductive </li></ul>
  3. 4. The Cell <ul><li>Basic Structural and Functional Unit of the body </li></ul>
  4. 5. Functions of the Cell <ul><li>Basic unit of life </li></ul><ul><li>Protection and support </li></ul><ul><li>Movement </li></ul><ul><li>Communication </li></ul><ul><li>Cell metabolism and energy release </li></ul><ul><li>Inheritance </li></ul>
  5. 6. The Cell <ul><li>Composed of the Cytoplasm, Cell Membrane, the organelles, the nucleus and the inclusions </li></ul>
  6. 8. The Cell <ul><li>The cytoplasm is the viscous, translucent, watery material where the organelles are located </li></ul>
  7. 9. The Cell <ul><li>The Cell membrane is a semi-permeable membrane that serves as the boundary separating the cellular structures from the external environment </li></ul>
  8. 11. The cell membrane <ul><li>Selectively permeable </li></ul><ul><li>Bi-lipid layers </li></ul><ul><li>Functions to regulate passage of substances </li></ul>
  9. 12. The cell membrane <ul><li>Phagocytosis- cell eating </li></ul><ul><li>Pinocytosis- cell drinking </li></ul><ul><li>Endocytosis- cell engulfment </li></ul><ul><li>Exocytosis- cell excretion </li></ul>
  10. 15. Cell connections <ul><li>Tight junction= binds adjacent cell together and form permeability barrier, which regulates what material crosses </li></ul><ul><li>Desmosome= mechanical link that functions to bind cell to one another </li></ul><ul><ul><li>Hemidesmosomes= anchor the cell to the basement membrane </li></ul></ul><ul><li>Gap junction= small channel that allows molecules and ions to pass from one another </li></ul>
  11. 17. The cellular organelles <ul><li>These are the cellular metabolic units with specific functions to maintain the life of the cell </li></ul><ul><li>These include the mitochondrion, endoplasmic reticulum, ribosome, golgi apparatus, lysosomes, peroxisomes, cytoskeleton and centrosomes </li></ul>
  12. 18. The mitochondrion <ul><li>The POWERHOUSE of the cell </li></ul><ul><li>Contains enzymes and the complexes responsible for the production of the ATP </li></ul><ul><li>Also contains mitochondrial DNA </li></ul><ul><li>Metabolic processes occurring in this organelle include – Kreb’s cycle, beta-oxidation of fats, urea cycle, heme synthesis </li></ul><ul><li>This organelle is maternally inherited </li></ul>
  13. 20. The endoplasmic reticulum <ul><li>An extensive network of membrane-enclosed tubules </li></ul><ul><li>There are two types- Rough and Smooth endoplasmic reticulum </li></ul><ul><li>Rough endoplasmic reticulum is covered with ribosomes  site of protein synthesis </li></ul><ul><li>Smooth endoplasmic reticulum has no ribosome  site of lipid synthesis </li></ul>
  14. 22. Ribosome <ul><li>Together with the endoplasmic reticulum  is the site of protein synthesis </li></ul><ul><li>Maybe found in the cytoplasm and in the mitochondria </li></ul><ul><li>They may be free or attached to the endoplasmic reticulum </li></ul>
  15. 23. Golgi Apparatus <ul><li>This organelle modifies, concentrates and packages proteins </li></ul><ul><li>This also packages enzymes into lysozomes </li></ul><ul><li>Proteins and enzymes usually are transported from the rough endoplasmic reticulum to the golgi apparatus </li></ul>
  16. 25. The lysosomes <ul><li>These are membrane-limited digestive bodies that contain enzymes that break down foreign or damaged materials </li></ul><ul><li>The enzymes digest all materials brought in by phagocytosis </li></ul>
  17. 27. The peroxisomes <ul><li>Similar to lysosomes, these are membrane-bound sacs containing oxidases (not found in the lysosomes) </li></ul><ul><li>Oxidases are enzymes capable of reducing oxygen to hydrogen peroxide </li></ul>
  18. 28. The cytoskeleton <ul><li>A series of tubules and rods that runs through the cytoplasm supporting the cellular structures </li></ul><ul><li>This is also responsible for cellular movements </li></ul>
  19. 30. The centrosomes <ul><li>This contains the centrioles  short cylinders adjacent to the nucleus responsible for cellular division </li></ul>
  20. 31. The cellular inclusions <ul><li>These are non-functional units made up of chemical substances </li></ul><ul><li>These may or may not be present in all cells </li></ul><ul><li>Examples are pigments, granules, and fat globules </li></ul>
  21. 32. Cilia and Flagella <ul><li>Cilia are short, hair-like extensions that occur in large numbers on the outer surface of the cell </li></ul><ul><li>Flagella are long projections formed by centrioles that propel the cell </li></ul>
  22. 34. The Nucleus <ul><li>The central control of the cell </li></ul><ul><li>Controls cell growth, metabolisms and reproduction </li></ul><ul><li>Contains DNA </li></ul><ul><li>Contains chromosomes  DNA + proteins appearing as granules in the non-dividing cell </li></ul><ul><li>Genes  segments of chromosomes </li></ul>
  23. 36. <ul><li>Cell Division </li></ul><ul><li>Formation of two daughter cell from a single parent cell. </li></ul><ul><li>Mitosis – formation of new cell necessary for growth and tissue repair. </li></ul><ul><li>Meosis – formation of sex cell necessary for the reproduction. </li></ul>
  24. 37. Cellular division <ul><li>Two types- Mitosis and Meiosis </li></ul><ul><li>Mitosis- equal division of materials which yields two exact duplicates of the original cell </li></ul><ul><li>The diploid number (46) of chromosomes is maintained </li></ul><ul><li>All of the body cells undergo mitosis except the gametes or sex cells </li></ul>
  25. 38. <ul><li>Mitosis </li></ul><ul><li>All body cell undergo mitosis except sex cell. There are two step in mitosis: </li></ul><ul><li>Genetic material within the cell is replicated. </li></ul><ul><li>Cell divided to form two daughter with same amount and type of DNA. </li></ul>
  26. 39. The cellular division <ul><li>Five steps of cellular division I-P-M-A-T </li></ul><ul><li>Interphase - inactive or resting state </li></ul><ul><li>Prophase -Chromatin coils to form chromosomes, centrioles begin to assemble </li></ul><ul><li>Metaphase -chromosomes line the equator, and they split lengthwise </li></ul><ul><li>Anaphase -Chromatids separate and move to the opposite poles </li></ul><ul><li>Telophase -chromosomes uncoil and nucleoli reappear </li></ul>
  27. 40. <ul><li>INTERPHASE – time between cell division during which DNA replicate. DNA strand separate where old strand joined with new strand of DNA to form two new DNA molecule. </li></ul>
  28. 41. <ul><li>Four stage of Mitosis </li></ul><ul><li>Prophase – chromatin condensed into chromosome. Chromosome consist of two chromatin join by centromere. </li></ul><ul><li>Centriole move to opposite pole. </li></ul><ul><li>Nucleus and nuclear envelope disappear. </li></ul><ul><li>2. Metaphase – chromosome aligned at the center, w/ spindle fiber. </li></ul><ul><li>3. Anaphase – chromatin separate to form two sets of identified chromosome. Chromosome assisted by spindle fiber. </li></ul>
  29. 42. <ul><li>4. Telophase – chromosome disperse. </li></ul><ul><li>Nuclear membrane and nucleolus formed. </li></ul><ul><li>Cytoplasm divided into two cell. </li></ul>
  30. 43. <ul><li>Differentiation – process by which cell develop with specialized function. </li></ul><ul><li>Egg and sperm cell formed single cell during fertilization divided by mitosis to form two cell then become four cell and so forth which differentiate, give rise to different cell. E.g. bone cell, muscle cell </li></ul>
  31. 45. The cellular division <ul><li>Meiosis is a reduction division occurring in the sex cells </li></ul><ul><li>Sex cells have only one pair of chromosomes (23)  haploid number </li></ul>
  32. 46. <ul><li>Cell Physiology </li></ul>
  33. 48. DIFFUSION <ul><li>The movement of SOLUTES or particles in a solution from a higher concentration to a lower concentration </li></ul><ul><li>This is a passive process, no energy is required </li></ul>
  34. 50. OSMOSIS <ul><li>The movement of solvent or water from a diluted solution into a more concentrated solution through a semi-permeable membrane </li></ul><ul><li>The pressure that draws water inside the vessel which is more concentrated is called Osmotic pressure </li></ul>
  35. 52. Filtration <ul><li>If a sugar is placed in plain water, the glucose molecules will dissolve and distribute in the solution </li></ul><ul><li>Factors that affect diffusion-concentration gradient, particle size, solubility and temperature </li></ul>
  36. 53. Special osmosis <ul><li>A special type of osmotic pressure is exerted by the proteins in the plasma. It is called ONCOTIC PRESSURE </li></ul>
  37. 54. FILTRATION <ul><li>The movement of both solute and solvent by hydrostatic pressure, i.e., from an area of a higher pressure to an area of a lower pressure </li></ul><ul><li>An example of this process is urine formation </li></ul>
  38. 55. Hydrostatic pressure <ul><li>Hydrostatic pressure is the pressure exerted by the fluid against the container </li></ul><ul><li>Increased hydrostatic pressure is one mechanism producing edema </li></ul>
  39. 56. Active transport <ul><li>This is the movement of solutes across a membrane from a lower concentration to a higher concentration with utilization of energy </li></ul><ul><li>Example is the Sodium-Potassium pump, Endocytosis and Exocytosis </li></ul>
  40. 59. Tissue <ul><li>Group of cells with similar structure and function </li></ul><ul><li>There are four (4) Basic types </li></ul><ul><li>Epithelial </li></ul><ul><li>Connective </li></ul><ul><li>Muscle </li></ul><ul><li>Nervous </li></ul>
  41. 60. BODY TISSUES <ul><li>Epithelium </li></ul><ul><li>Lining, covering and glandular tissues of the body </li></ul><ul><li>The functions are to protect, absorb, filtrate and secrete substances </li></ul>
  42. 61. Epithelial tissues <ul><li>Simple epithelium </li></ul><ul><li>Lined by ONE Layer of cell </li></ul><ul><li>Stratified epithelium </li></ul><ul><li>Lined by many layers of cells </li></ul>
  43. 62. Epithelial tissues <ul><li>Simple epithelia </li></ul><ul><li>1. Simple squamos- alveoli, BV </li></ul><ul><li>2. Simple cuboidal- glands </li></ul><ul><li>3. Simple columnar- GI tract </li></ul><ul><li>4. Pseudo stratified epithelium- bronchial lining </li></ul>
  44. 63. Epithelial tissues <ul><li>Stratified epithelium </li></ul><ul><li>1. Stratified Squamos- skin </li></ul><ul><li>2. Stratified cuboidal- reproductive duct </li></ul><ul><li>3. Transitional epithelium- bladder and ureter </li></ul>
  45. 67. Connective tissues <ul><li>Bone </li></ul><ul><li>Cartilage </li></ul><ul><li>Muscle </li></ul><ul><li>Blood </li></ul><ul><li>Blood vessels </li></ul><ul><li>Adipose tissue </li></ul>
  46. 71. The SKIN
  47. 72. The Integumentary System <ul><li>The largest body system </li></ul><ul><li>Includes the skin and accessory structures like the hair, nails, and glands </li></ul><ul><li>Function: Protection of body structures and regulation of body temperature </li></ul>
  48. 74. The Skin as first line protection <ul><li>The skin seals off the body from the immediate environment </li></ul><ul><li>There are three layers of the skin: Epidermis, dermis, and hypodermis. </li></ul>
  49. 75. Skin cells <ul><li>There are many other cells aside from the keratinized squamos cells of the skin. </li></ul><ul><li>Melanocytes produce pigment melanin. </li></ul><ul><li>Langerhan’s cells participates in the immune system. </li></ul><ul><li>Histiocytes are specialized macrophages </li></ul>
  50. 77. Skin as temperature regulator <ul><li>Abundant nerves, blood vessels and glands are within the skin’s deeper layer </li></ul><ul><li>They aid in temperature regulation </li></ul><ul><li>Blood vessels constrict or dilate depending on the temperature </li></ul>
  51. 78. Skin functions <ul><li>Sweat glands produce sweat to control temperature by evaporation </li></ul><ul><li>The piloerector ( arrector pili ) muscles will contract to raise the hairs to trap the heat </li></ul>
  52. 79. Other skin functions <ul><li>Vitamin D synthesis </li></ul><ul><ul><li>7-dehydrocholesterol  Cholecalciferol (D3) </li></ul></ul><ul><li>Route of excretion </li></ul><ul><ul><li>Insensible fluid loss of about 500 ml/day </li></ul></ul><ul><ul><li>Sweat contains water, electrolytes, urea and lactic acid </li></ul></ul>
  53. 80. Other skin functions <ul><li>Skin and mucus membrane are the first line defense of the body in immunity </li></ul><ul><li>Skin has receptors for pain, cold, pressure and heat. </li></ul>
  54. 81. The Skin layers: EPIDERMIS <ul><li>The outermost layer with stratified squamos epithelium </li></ul><ul><li>Varies in thickness depending on the body part </li></ul><ul><li>Thinnest in the eyelids and thickest in the soles and palms </li></ul>
  55. 82. EPIDERMIS <ul><li>The layers are- C-L-G-S-B </li></ul><ul><li>The outermost layer is the stratum corneum  with keratin </li></ul><ul><li>The stratum basale is the layer which regenerates/replaces new skin cells </li></ul><ul><li>Melanocytes in the skin produce melanin </li></ul>
  56. 83. The Skin layers: DERMIS <ul><li>The second layer- cutis vera </li></ul><ul><li>Is flexible and elastic </li></ul><ul><li>Two layers- papillary and reticular </li></ul><ul><li>Contains blood vessels, lymphatic vessels, nerves and appendages </li></ul>
  57. 84. The Skin layers: DERMIS <ul><li>The connective tissues in the dermis contain </li></ul><ul><ul><li>collagen (gives its strength) </li></ul></ul><ul><ul><li>elastin (gives its flexibility) and </li></ul></ul><ul><ul><li>reticular fibers (connect collagen and elastin) </li></ul></ul>
  58. 85. The Skin layers: Hypodermis <ul><li>This is the subcutaneous tissue </li></ul><ul><li>Not strictly a part of the skin </li></ul><ul><li>Functions to insulate the body to conserve heat </li></ul>
  59. 86. Hypodermis <ul><li>Serves as the energy storage and mechanical shock absorber </li></ul><ul><li>With little vascular supply and scant nerve supply </li></ul>
  60. 87. The Skin appendages <ul><li>Hairs- long shafts composed of keratin. Expanded lower end is called hair bulb or root. There are extensive nerve and blood supply in the hair bulbs </li></ul><ul><li>Nails-flattened structure of specialized type of keratinized surface. The visible part is the nail body . </li></ul>
  61. 88. Fig. 5.5
  62. 89. Appendages <ul><li>Sebaceous glands-glands which produces an oily material called sebum, found in all body parts except the palms and soles. </li></ul><ul><li>Sweat glands or sudoriferous glands- glands which secrete sweat, found in all body parts except in the nipples. Two types exist- Eccrine and Apocrine </li></ul>
  63. 90. Fig. 5.6
  64. 91. The Musculoskeletal System <ul><li>This system consists of the muscles, tendons, ligaments, bones, cartilage, joints, and bursae </li></ul>
  65. 92. The Musculoskeletal System <ul><li>Functions: </li></ul><ul><ul><li>Locomotion and protection </li></ul></ul><ul><ul><li>blood production in the bone marrow </li></ul></ul><ul><ul><li>heat generation, </li></ul></ul><ul><ul><li>maintenance of posture and </li></ul></ul><ul><ul><li>storage of minerals </li></ul></ul>
  66. 93. The Muscles <ul><li>Three types of muscles exist in our body </li></ul><ul><li>Voluntary skeletal muscle </li></ul><ul><li>Involuntary cardiac muscle </li></ul><ul><li>Involuntary visceral smooth muscle </li></ul>
  67. 94. The Muscles <ul><li>Muscles are composed of muscle fibers having numerous nuclei and striations </li></ul>
  68. 98. Properties of Muscles <ul><li>Electrical excitability </li></ul><ul><ul><li>Ability to contract to certain stimuli </li></ul></ul><ul><li>Contractility </li></ul><ul><ul><li>Ability to contract forcefully when stimulated </li></ul></ul><ul><li>Extensibility </li></ul><ul><ul><li>Ability to stretch without being damaged </li></ul></ul><ul><li>Elasticity </li></ul><ul><ul><li>Ability to return to its original length and shape </li></ul></ul>
  69. 99. Muscle Physiology <ul><li>Muscle fibers are enclosed sheaths- perimysium, epimysium and endomysium </li></ul><ul><li>Each muscle cell has actin and myosin filaments arranged in a sarcomere </li></ul><ul><li>This sarcomere is the basic structural unit of the muscle </li></ul>
  70. 100. Muscle Physiology <ul><li>Muscle contraction occurs as actin and myosin slide past one another causing the sarcomeres to shorten </li></ul><ul><li>Calcium ion is released by the muscle endoplasmic reticulum to initiate contraction </li></ul><ul><li>ATP is used both for muscle contraction and muscle relaxation </li></ul>
  71. 103. Fig. 7.5a
  72. 104. Fig. 7.6
  73. 105. Fig. 7.7a
  74. 106. Fig. 7.7b
  75. 107. Muscle Physiology <ul><li>Muscle contraction can be of two types </li></ul><ul><li>1. ISOMETRIC- iso = same, metric=distance: The length of the muscle does not change, but the tension increases </li></ul><ul><li>2. ISOTONIC- iso =same, tonus=tone: The amount of muscle tension is constant but the length of the muscle varies </li></ul>
  76. 108. Muscle Physiology <ul><li>Muscle tone= refers to the constant tension produced by muscles of the body for long periods of time </li></ul><ul><li>FAST-twitch muscles= contract quickly and fatigue quickly </li></ul><ul><li>SLOW-twitch muscles=contract slowly and are more resistant to fatigue </li></ul>
  77. 109. Muscle Physiology <ul><li>Smooth Muscle= is not striated, contracts more slowly, is autorhythmic and under involuntary control </li></ul><ul><li>Cardiac muscle- is striated, is autorhythmic , and under involuntary control </li></ul>
  78. 110. MUSCLE and JOINT MOVEMENTS <ul><li>Flexion- decreasing the angle between two joints </li></ul><ul><li>Extension- increasing the angle between two joints </li></ul><ul><li>Abduction- movement of the limb away from the midline </li></ul><ul><li>Adduction- movement of the limb towards the midline </li></ul>
  79. 111. MUSCLE and JOINT MOVEMENTS <ul><li>Internal rotation- moving the body part inward towards the midline </li></ul><ul><li>External rotation- moving the body part outward away from the midline </li></ul><ul><li>Supination- turning a body part upward </li></ul><ul><li>Pronation- turning a body part downward </li></ul>
  80. 112. MUSCLE and JOINT MOVEMENTS <ul><li>Inversion- turning the foot inward </li></ul><ul><li>Eversion- turning the foot outward </li></ul><ul><li>Retraction- moving a body part backward </li></ul><ul><li>Protraction- moving a body aprt forward </li></ul>
  81. 113. Muscles of the face <ul><li>1. Frontalis </li></ul><ul><li>2. Orbicularis oculi </li></ul><ul><li>3. orbicularis oris </li></ul><ul><li>4. Buccinator </li></ul><ul><li>5. Zygomaticus </li></ul><ul><li>Facial Nerve innervation </li></ul>
  82. 114. Muscles of Mastication <ul><li>1 . Masseter </li></ul><ul><li>2. Temporalis </li></ul><ul><li>3. Pterygoid muscles </li></ul><ul><li>Innervated by TRIGEMINAL NERVE </li></ul>
  83. 115. Muscles of the neck <ul><li>1. Platysma </li></ul><ul><li>2. Sternocleidomastoid </li></ul>
  84. 116. Muscle of the upper limb <ul><li>1. Biceps </li></ul><ul><li>2. triceps </li></ul><ul><li>3. deltoid </li></ul>
  85. 117. Muscles of the lower limb <ul><li>1. Hamstring muscles </li></ul><ul><li>2. Quadriceps </li></ul><ul><li>3. Gluteal muscles </li></ul><ul><li>4. calf muscles </li></ul>
  86. 118. TENDONS <ul><li>These are bands of fibrous connective tissue that attach muscles to bones </li></ul>
  87. 119. LIGAMENTS <ul><li>These are dense, strong, flexible bands of fibrous connective tissue that bind bones to other bones </li></ul>
  88. 120. BONES <ul><li>Bone is a living growing tissue made of porous mineralized structure. </li></ul><ul><li>The human skeleton contains 206 bones </li></ul><ul><li>Axial bones are bones on the midline like the vertebrae, skull, facial bones, ribs and sternum </li></ul><ul><li>Appendicular bones include the scapulae, bones of the arms and legs </li></ul>
  89. 122. Classification of Bones <ul><li>Long bones- - These bones have a shaft and ends. Ex: tibia, humerus, femur </li></ul><ul><li>Short bones- Small and cubical shaped- Ex: carpals and tarsals </li></ul><ul><li>Irregular bones- vertebrae, mandible </li></ul><ul><li>Sesamoid bones- bones embedded in the tendons. Ex:patella </li></ul><ul><li>Flat bones- with spongy bones inside. Ex: scapulae, ribs, clavicle </li></ul>
  90. 123. Structure of the bone <ul><li>Long bones have a diaphysis ( shaft) and epiphysis (ends) </li></ul><ul><li>Bones consist of layers of calcified matrix occupied by bone cells. </li></ul><ul><li>The outer layer of bone is composed of dense compact bone (cortical bone) </li></ul><ul><li>The inner layer is composed of spongy cancellous bones </li></ul>
  91. 125. Bone Structure <ul><li>Blood supply of bones reaches by way of arterioles in the haversian canal, through the vessels in the Volkmann's canal </li></ul><ul><li>Bone formation can be from the cartilage and from the membrane </li></ul>
  92. 126. Bone Structure <ul><li>OSTEOBLAST- bone cell responsible for bone formation and calcification </li></ul><ul><li>OSTEOCLAST- bone cell responsible for bone resorption and destruction </li></ul>
  93. 127. Bone Ossification <ul><li>Ossification is the formation of bone by the osteoblasts. This involves the mineralization of bones from a cartilage (endochondral) and from a membrane (membranous ). </li></ul>
  94. 128. Fig. 6.5a
  95. 129. Fig. 6.6
  96. 130. Bone Remodeling <ul><li>Bone remodeling involves the removal of old bones by cells called osteoclasts and deposition of new bones by the osteoblasts. </li></ul><ul><li>Bone is the major storage of calcium </li></ul><ul><li>If calcium levels in the blood falls, it is removed from the bone </li></ul>
  97. 131. Bone repair <ul><li>When a bone is broken, blood vessels are also damaged  clot </li></ul><ul><li>2-3 days after injury, blood vessels and cells invade the blood clot  callus formation </li></ul><ul><li>Osteoblasts enter the callus and begin to form a spongy bone </li></ul><ul><li>Immobilization of the bone is required because the delicate new matrix of bone is easily damaged by excessive movement </li></ul>
  98. 132. Fig. 6.8
  99. 133. The Skull <ul><li>Skeleton of the head </li></ul><ul><li>Made of 21 bones </li></ul><ul><li>Cranial bones </li></ul><ul><ul><li>Frontal </li></ul></ul><ul><ul><li>Parietal </li></ul></ul><ul><ul><li>Temporal </li></ul></ul><ul><ul><li>occipital </li></ul></ul>
  100. 134. The Skull <ul><li>Facial bones </li></ul><ul><ul><li>Maxilla </li></ul></ul><ul><ul><li>Mandible </li></ul></ul><ul><ul><li>Zygoma </li></ul></ul><ul><ul><li>Nasal </li></ul></ul><ul><ul><li>Vomer </li></ul></ul><ul><ul><li>Palatine </li></ul></ul>
  101. 135. The paranasal sinuses <ul><li>These are air-filled cavities in the facial bones surrounding the nose and open into the nasal cavity </li></ul><ul><li>They decrease the weight of the skull and act as resonator of sounds </li></ul><ul><li>Frontal, maxillary, ethmoid and sphenoid </li></ul>
  102. 137. The Vertebrae <ul><li>Composed of 32-33 bones </li></ul><ul><li>7 cervical </li></ul><ul><li>12 thoracic </li></ul><ul><li>5 lumbar </li></ul><ul><li>5 sacral </li></ul><ul><li>3-4 coccygeal </li></ul>
  103. 138. Functions of the vertebrae <ul><li>1. Supports the weight of the head and trunk </li></ul><ul><li>2. Protects the spinal cord </li></ul><ul><li>3. Allows spinal nerves to exit the spinal cord </li></ul><ul><li>4. Provides a site for muscle attachment </li></ul><ul><li>5. Permits the movement of the head and trunk </li></ul>
  104. 139. The Cervical Vertebrae <ul><li>7 in number </li></ul><ul><li>C1- atlas </li></ul><ul><li>C2- axis </li></ul><ul><li>C7- cervical prominence </li></ul><ul><li>Atlas and occipital bone= </li></ul><ul><li>“yes” motion </li></ul><ul><li>Atlas and Axis= </li></ul><ul><li>“no” motion </li></ul>
  105. 140. The Thorax <ul><li>Made up of the sternum and ribs </li></ul><ul><li>The sternum has 3 parts </li></ul><ul><ul><li>Manubrium </li></ul></ul><ul><ul><li>Body </li></ul></ul><ul><ul><li>Xiphoid process </li></ul></ul><ul><ul><li>The slight elevation in the sternum is called the Sternal Angle of Louis . It identifies the location of the second rib </li></ul></ul>
  106. 141. The Ribs <ul><li>The ribs are 12 pairs </li></ul><ul><ul><li>True ribs= 1-7 </li></ul></ul><ul><ul><li>False ribs= 8-10 </li></ul></ul><ul><ul><li>Floating ribs=11-12 </li></ul></ul>
  107. 143. The shoulder <ul><li>The clavicle and scapulae constitute the shoulder </li></ul><ul><li>The clavicle </li></ul><ul><ul><li>Articulates with the sternum </li></ul></ul><ul><ul><li>Most commonly fracture bone </li></ul></ul><ul><li>The Scapulae </li></ul><ul><ul><li>Attached to the ribs and vertebrae by muscles only </li></ul></ul><ul><ul><li>Has an acromion process, where the clavicle attaches </li></ul></ul>
  108. 145. The Upper extremity <ul><li>Composed of the following bones </li></ul><ul><li>Humerus </li></ul><ul><li>Ulna </li></ul><ul><li>Radius </li></ul><ul><li>Carpals (wrist bones) </li></ul><ul><li>Metacarpals </li></ul><ul><li>Phalanges </li></ul>
  109. 147. The pelvic girdle <ul><li>Composed of the 3 fused bones- pubis, ilium and ischium </li></ul><ul><li>Constitute the hip bone </li></ul>
  110. 148. The pelvic girdle <ul><li>Female pelvis has the following structure: The pelvic inlet is large/oval, symphysis is shallow. obturator foramen is oval or triangular, sacrum is broader </li></ul><ul><li>The male pelvis has the following: The pelvic inlet is small/round to heart-shape, symphysis is deep. Obturator foramen is round </li></ul>
  111. 149. Fig. 6.32
  112. 152. The Lower extremity bones <ul><li>Composed of the </li></ul><ul><li>Thigh bones- femur </li></ul><ul><li>The leg bones- Tibia and Fibula </li></ul><ul><li>The ankle- tarsal bones </li></ul><ul><li>The foot- metatarsal bones </li></ul>
  113. 154. CARTILAGE <ul><li>A dense connective tissue that consists of fibers embedded in a strong, gel-like substance. </li></ul><ul><li>Cartilage supports and shapes various structures such as the ear pinna, intervertebral disks, ear canal, larynx, etc. </li></ul><ul><li>It serves as cushion and shock absorber </li></ul>
  114. 156. Types of Cartilage <ul><li>Fibrous cartilage </li></ul><ul><ul><li>Found in the intervertebral disks </li></ul></ul><ul><li>Hyaline cartilage </li></ul><ul><ul><li>Found in the symphisis, the thyroid cartilage </li></ul></ul><ul><li>Elastic cartilage </li></ul><ul><ul><li>Found in the ears, the epiglottis </li></ul></ul>
  115. 157. Joints
  116. 158. Fig. 6.39a
  117. 159. Fig. 6.39b
  118. 160. Fig. 6.40a
  119. 161. Fig. 6.40b
  120. 162. Fig. 6.40c
  121. 163. Joints <ul><li>These are point of attachment or contact between two bones </li></ul><ul><li>Variously classified according to its movement and flexibility </li></ul><ul><li>Fibrous joints- with fibrous tissue with little or no movement </li></ul><ul><li>Cartilaginous joints- with cartilage </li></ul><ul><li>Synovial joints- with capsule; freely movable joints </li></ul>
  122. 165. Synovial joints <ul><li>Freely movable joints </li></ul><ul><li>With joint cavity/capsule </li></ul><ul><li>Articular surface </li></ul><ul><li>Synovial membrane </li></ul><ul><li>Synovial fluid </li></ul>
  123. 166. Synovial joints <ul><li>Plane joint- intercarpal joint of wrist </li></ul><ul><li>Hinge joint- elbow and ankle </li></ul><ul><li>Pivot- atlas and axis </li></ul><ul><li>Condyloid- “egg-shape” metacarpophalengeal joint </li></ul>
  124. 167. Synovial joints <ul><li>Saddle joint- joint of the thumb </li></ul><ul><li>Ball and socket- hip joint </li></ul>
  125. 168. Bursae <ul><li>Small synovial fluid sacs located at friction points around joints, between tendons, ligaments and bones </li></ul><ul><li>Act as cushions, decrease stress on adjacent structure </li></ul>
  126. 170. The Nervous System
  127. 171. The Nervous System <ul><li>The nervous system coordinates all body functions, enabling a person to adapt to changes in internal and external environment </li></ul><ul><li>The nervous system is composed mainly of the nerve cells (neurons) and supporting cells (neuroglia) </li></ul>
  128. 172. The neuron <ul><li>This is the basic conducting cell of the nervous system </li></ul><ul><li>Highly specialized but cannot reproduce itself </li></ul><ul><li>Main parts are the cell body (soma), the fibers: axon and dendrites. </li></ul>
  129. 173. The neuron <ul><li>The axon is a long process with myelin sheath. This conducts impulses away from the cell body </li></ul><ul><li>The dendrites are short, thick, diffuse branching processes that receive impulses and conduct them towards the cell body </li></ul>
  130. 175. The neuroglia <ul><li>The supporting cells </li></ul><ul><li>They supply nutrients to the neurons and help maintain the electrical potential </li></ul><ul><li>They also form part of the blood-brain barrier </li></ul>
  131. 176. The neuroglia <ul><li>Oligodendrocytes produce myelin sheath in the CN </li></ul><ul><li>Schwann cells produce myelin sheath in the peripheral NS </li></ul>
  132. 180. The Organization of the Nervous System <ul><li>The nervous system is divided functionally and structurally into 2 parts </li></ul><ul><li>1. Central Nervous System- the Brain and the spinal cord </li></ul><ul><li>2. Peripheral Nervous System- the cranial nerves and spinal nerves </li></ul>
  133. 183. The Organization of the nervous System <ul><li>The Peripheral Nervous System is further classified into THREE Functional Divisions </li></ul><ul><li>1. The Somatic Nervous System- controls the skeletal muscles </li></ul><ul><li>2. The Autonomic Nervous System- controls the visceral organs </li></ul><ul><li>3. The Enteric Nervous System- controls the functions of the GIT </li></ul>
  134. 184. The Central Nervous System <ul><li>Composed of the brain </li></ul><ul><li>The brain consists of the gross structures: cerebrum, cerebellum, brainstem and the diencephalon. </li></ul><ul><li>Diencephalon- Thalamus. Hypothalamus and pineal body </li></ul><ul><li>Brainstem- Pons, medulla and Midbrain </li></ul>
  135. 186. Fig. 8.23
  136. 187. The Cerebrum <ul><li>This is the largest part of the brain </li></ul><ul><li>Consists of right and left hemisphere connected by the corpus callosum </li></ul><ul><li>Each cerebral hemisphere is composed of different lobes- frontal, temporal, parietal and occipital </li></ul><ul><li>Embedded in the cerebrum is the BASAL ganglia </li></ul>
  137. 189. The Frontal Lobe of the cerebrum <ul><li>Influences the personality of the person </li></ul><ul><li>Also responsible for judgment, abstract reasoning, social behavior, language expression and motor movement. </li></ul>
  138. 190. The Temporal lobe of the Cerebrum <ul><li>This part of the cerebrum controls the hearing, language comprehension, storage and recall of memories </li></ul><ul><li>The LIMBIC system is deeply located in the temporal lobe. This controls the basic drives such as hunger, anger, emotion and sexual drive. </li></ul>
  139. 191. The Parietal lobe of the cerebrum <ul><li>This is the principal center for the reception and interpretation of Sensation </li></ul><ul><li>This part interprets and integrates the sensory inputs like touch, temperature and pain </li></ul><ul><li>It interprets size, shape, distance and texture </li></ul>
  140. 192. The occipital lobe of the cerebrum <ul><li>This functions mainly to interpret visual stimuli </li></ul>
  141. 193. Speech areas in the cerebrum <ul><li>1. Wernicke’s area- responsible for the sensory reception of speech. </li></ul><ul><li>2.Broca’s Area- responsible for the motor speech </li></ul>
  142. 195. Fig. 8.28
  143. 196. The Cerebellum <ul><li>The second largest brain region </li></ul><ul><li>Has also two hemispheres </li></ul><ul><li>Functions to maintain muscle tone, coordinate muscle movement, posture and control balance/equilibrium </li></ul><ul><li>If this is damaged, muscle tone decreases and fine motor movements become very clumsy </li></ul>
  144. 198. The Brainstem <ul><li>Lies inferior to the cerebrum </li></ul><ul><li>Continuous with the cerebrum and the spinal cord </li></ul><ul><li>It is composed of the midbrain, the pons and the medulla oblongata </li></ul><ul><li>Functions: houses the center for respiration and cardiovascular system </li></ul>
  145. 199. The Midbrain <ul><li>This connects with the cerebrum </li></ul><ul><li>Contains numerous ascending and descending tracts and fibers </li></ul>
  146. 200. The Pons <ul><li>Connects the cerebellum with the cerebrum </li></ul><ul><li>Houses the respiratory center and cardiovascular center </li></ul><ul><li>Exit points for cranial nerves 5, 6 and 7 </li></ul>
  147. 201. The Medulla oblongata <ul><li>The most inferior portion of the brainstem </li></ul><ul><li>Serves as the center for autonomic reflexes to maintain homeostasis, regulating respiratory vasomotor and cardiac functions </li></ul><ul><li>Serves as exit of cranial nerves 9,10,11 and 12 </li></ul>
  148. 202. The Diencephalon <ul><li>The thalamus and the hypothalamus </li></ul><ul><li>The thalamus is the relay station of all sensory stimuli towards the brain </li></ul><ul><li>The hypothalamus controls body temperature, appetite, water balance, pituitary secretions and sleep-wake cycle </li></ul>
  149. 203. The Basal ganglia
  150. 204. Brain circulation: The circle of Willis
  151. 205. The spinal cord <ul><li>A long cylindrical structure extending from the foramen magnum to the L1 in adult, L3/L4 in pedia </li></ul>
  152. 206. The spinal cord <ul><li>In the cross section of the spinal cord, we find the GRAY matter- contains neurons; and WHITE matter-consists of nerve fibers </li></ul><ul><li>There are 31 pairs of spinal nerves that exit the spinal cord </li></ul>
  153. 209. The spinal cord <ul><li>Each spinal nerve is formed by the dorsal root (sensory) and the ventral root (motor) </li></ul><ul><li>Cervical segments= 8 pairs </li></ul><ul><li>Thoracic segments=12 pairs </li></ul><ul><li>Lumbar= 5 pairs </li></ul><ul><li>Sacral=5 pairs </li></ul><ul><li>Coccygeal=1 pair </li></ul>
  154. 210. The Meninges <ul><li>These are 3 connective tissue layers surrounding the brain and spinal cord. </li></ul><ul><li>1. DURA MATER- the superficial, thickest layer. The area above the dura mater is called epidural space </li></ul><ul><li>2. ARACHNOID- second layer, thin and wispy. </li></ul><ul><li>3. PIA MATER- the deepest layer, adhered to the brain and spinal cord substance </li></ul>
  155. 212. The Meninges <ul><li>The space in between the arachnoid and pia mater is called the arachnoid space </li></ul><ul><li>This arachnoid space contains the cerebro-spinal fluid (CSF) </li></ul><ul><li>In this space, blood vessels are also found </li></ul>
  156. 213. The Ventricles <ul><li>These are CSF filled cavities in the brain </li></ul><ul><li>The lateral ventricle- found in the cerebrum </li></ul><ul><li>The third ventricle- in the center of the thalamus and hypothalamus </li></ul><ul><li>The fourth ventricle- located at the base of the cerebellum </li></ul>
  157. 214. The CSF <ul><li>This is the fluid found inside the ventricles that bathe the brain and spinal cord </li></ul><ul><li>Function: provides protective cushion around the CNS </li></ul><ul><li>Produced by the choroid plexus in the ventricles </li></ul><ul><li>Absorbed by the arachnoid granulations </li></ul>
  158. 215. Tracing the CSF pathway <ul><li>Lateral ventricle </li></ul><ul><li> Interventricular foramen of Monro </li></ul><ul><li> Third ventricle </li></ul><ul><li>Cerebral aqueduct of Sylvius </li></ul><ul><li>Fourth ventricle </li></ul><ul><li>Exits trough the median foramen of Magendie or the lateral foramen of Luscka </li></ul><ul><li>Subarachnoid spaces in the cisterna magna, spinal cord </li></ul><ul><li>subarachnoid space of the brain </li></ul><ul><li>superior sagittal sinus </li></ul>
  159. 217. The cranial nerves <ul><li>Are 12 pairs of nerves that exit the brain </li></ul><ul><li>Can be classified as </li></ul><ul><ul><li>Sensory </li></ul></ul><ul><ul><li>Motor </li></ul></ul><ul><ul><li>Mixed (sensory and motor) </li></ul></ul>
  160. 221. The Autonomic Nervous System <ul><li>The part of the peripheral nervous system that innervates cardiac muscles, smooth muscles and glands </li></ul><ul><li>Functionally divided into </li></ul><ul><li>Sympathetic Nervous System </li></ul><ul><li>Parasympathetic Nervous System </li></ul>
  161. 222. The SYMPATHETIC system <ul><li>Originates from the T1-L2/L3 segments of the spinal cord (thoracolumbar) </li></ul><ul><li>Utilized by the body for FLIGHT and FIGHT response </li></ul><ul><li>Neurotransmitter agents are Epinephrine and Norepinephrine (coming from the adrenal gland) </li></ul><ul><li>ADRENERGIC system </li></ul>
  162. 223. Sympathetic responses <ul><li>Increased: </li></ul><ul><ul><li>HR </li></ul></ul><ul><ul><li>RR </li></ul></ul><ul><ul><li>BP </li></ul></ul><ul><ul><li>Visual Acuity (Pupillary Dilation) </li></ul></ul><ul><ul><li>Smooth Muscle tone  sphincters are contracted </li></ul></ul><ul><ul><li>Vasoconstriction </li></ul></ul><ul><ul><li>Metabolism  ↑ glucose, ↑ fatty acids </li></ul></ul>
  163. 224. Sympathetic responses <ul><li>Decreased </li></ul><ul><ul><li>Peristalsis </li></ul></ul><ul><ul><li>Salivary secretions </li></ul></ul><ul><li>Ejaculation </li></ul>
  164. 225. Parasympathetic system <ul><li>CHOLINERGIC system </li></ul><ul><li>The vegetative system </li></ul><ul><li>Feed and Breed responses </li></ul><ul><li>Cranio-sacral location </li></ul><ul><li>Cranial nerves- 3, 7, 9, 10 and S2-S4 </li></ul><ul><li>Neurotransmitter is Acetylcholine </li></ul>
  165. 226. Parasympathetic responses <ul><li>Increased </li></ul><ul><ul><li>Gastric secretions </li></ul></ul><ul><ul><li>Salivary secretions </li></ul></ul><ul><ul><li>peristalsis </li></ul></ul><ul><li>Pupillary constriction </li></ul><ul><li>Decreased </li></ul><ul><li>Smooth muscle tone  sphincters are relaxed </li></ul><ul><li>erection </li></ul>
  166. 228. Nerve Physiology <ul><li>The nerve cells are excitable cells </li></ul><ul><li>Any stimulus will change the membrane potential and cause an action potential to generate  impulse transmission </li></ul><ul><li>The myelin sheath of the nerve cell is responsible for the SALTATORY conduction  increases the nerve transmission </li></ul>
  167. 230. Fig. 8.11
  168. 231. Fig. 8.12
  169. 232. The SYNAPSE <ul><li>This is the region where communication occurs between 2 neurons or between a neuron and a target cell </li></ul><ul><li>A neurotransmitter is released from the nerve cell towards the other cell with receptor </li></ul>
  170. 233. Fig. 8.13
  171. 235. Special Senses
  172. 236. The eye and the visual pathway <ul><li>Vision is made possible by the stimulation of the photoreceptor cells in the retina </li></ul><ul><li>Receptor cells are the RODS and CONES </li></ul><ul><li>The eye is made up of three layers </li></ul><ul><ul><li>Fibrous layer- sclerae and cornea </li></ul></ul><ul><ul><li>Uvea- choroid and iris and ciliary bodies </li></ul></ul><ul><ul><li>Nervous coat- retina </li></ul></ul>
  173. 239. Fig. 9.13
  174. 240. The optic nerve <ul><li>This is the collection of fibers from the cells in the retina </li></ul><ul><li>It passes through the brainstem as the optic chiasm </li></ul><ul><li>it will reach the occipital lobe for visual interpretation </li></ul>
  175. 242. The Vestibular apparatus <ul><li>This is the part of the ear that helps in equilibrium </li></ul><ul><li>Located in the inner ear </li></ul><ul><li>The saccule and utricle control LINEAR motion </li></ul><ul><li>The semicircular ducts control the Angular movement/ acceleration </li></ul>
  176. 244. The Hearing Apparatus
  177. 245. The Olfactory apparatus <ul><li>Consists of the nose and the olfactory nerve </li></ul><ul><li>Stimulation form the olfactory nerves will reach the limbic system of the brain </li></ul>
  178. 246. The Gustatory apparatus <ul><li>The receptor for taste are cells in the tongue group together called the taste buds </li></ul><ul><li>They are numerous in the vallate and fungiform papillae </li></ul>
  179. 247. The Gustatory apparatus <ul><li>Basic taste modalities </li></ul><ul><li>Sweet- tip of the tongue </li></ul><ul><li>Salty- over the dorsum of the tongue </li></ul><ul><li>Sour- sides of the tongue </li></ul><ul><li>Bitter- back of the tongue </li></ul>
  180. 249. Endocrine System
  181. 250. The Endocrine System <ul><li>This system is made up of widely distributed organs whose secretions (called HORMONES) are poured into the blood to reach the target cells </li></ul>
  182. 252. Hormones <ul><li>These are chemical substances released by the glands into the blood </li></ul><ul><li>Each hormone will go to the target organ and binds its receptor </li></ul><ul><li>Two types exists: </li></ul><ul><li>1. Peptides or protein hormones </li></ul><ul><li>2. Lipid or steroid hormones </li></ul>
  183. 255. The hormonal regulation <ul><li>There exists an inter-related regulation between the HYPOTHALAMUS, Pituitary and the endocrine gland. </li></ul>
  184. 258. The hormonal regulation <ul><li>We call it the Hypothalamic-pituitary-endocrine axis </li></ul><ul><li>The exception are the pancreas and the parathyroid gland </li></ul>
  185. 259. The endocrine glands <ul><li>The pituitary- anterior and posterior </li></ul><ul><li>The pineal gland </li></ul><ul><li>The thyroid gland </li></ul><ul><li>The parathyroid gland </li></ul><ul><li>The adrenal gland </li></ul><ul><li>The pancreas </li></ul><ul><li>The gonads- testes and ovary </li></ul>
  186. 261. The pituitary gland : anterior lobe <ul><li>Also called Adenohypophysis </li></ul><ul><li>Hormones produced </li></ul><ul><ul><li>Growth hormone </li></ul></ul><ul><ul><li>The stimulating hormones- ACTH, TSH, FSH and LH </li></ul></ul><ul><ul><li>Prolactin </li></ul></ul>
  187. 262. The pituitary gland: posterior lobe <ul><li>Also called the neurohypophysis </li></ul><ul><li>This lobe does not secrete hormones but only stores hormones </li></ul><ul><ul><li>Antidiuretic hormone (vasopressin) </li></ul></ul><ul><ul><li>Oxytocin </li></ul></ul>
  188. 263. The pineal gland <ul><li>Also called epiphysis cerebri </li></ul><ul><li>Secretes melatonin </li></ul>
  189. 264. The thyroid gland <ul><li>Located in the lower part of the anterior neck </li></ul><ul><li>With two lobes connected by the isthmus </li></ul>
  190. 265. The thyroid gland <ul><li>Secretes thyroxine (T4) and tri-iodothyronine (T3) </li></ul><ul><li>The T3 is the most active hormone </li></ul><ul><li>Function of T3/T4: Increase metabolic rate, essential for normal growth and maturation </li></ul>
  191. 268. The thyroid gland <ul><li>It also secretes CALCITONIN </li></ul><ul><li>This is released in response to an INCREASED calcium level in the blood </li></ul><ul><li>Function: decreases bone resorption and increases calcium excretion in the kidney to decrease the calcium levels </li></ul>
  192. 270. The parathyroid glands <ul><li>2 pairs (4) of yellowish glands closely related to the posterior surface of the thyroid gland </li></ul><ul><li>Secretes parathyroid hormone (PTH) </li></ul>
  193. 271. The parathyroid glands <ul><li>Functions of the hormone: </li></ul><ul><ul><li>Increases bone breakdown by osteoclasts </li></ul></ul><ul><ul><li>Increases Vitamin D synthesis </li></ul></ul><ul><ul><li>Increases Calcium level in the blood </li></ul></ul><ul><ul><li>Causes retention of calcium in the kidney </li></ul></ul>
  194. 273. The Adrenal glands <ul><li>a pair of gland resting on top of each kidney with 2 layers </li></ul><ul><li>ADRENAL CORTEX </li></ul><ul><ul><li>Secretes mineralocorticoids </li></ul></ul><ul><ul><li>Secretes glucocorticoids </li></ul></ul><ul><ul><li>Secretes androgens- sex hormones </li></ul></ul><ul><li>ADRENAL MEDULLA </li></ul><ul><ul><li>Secretes the cathecolamines- Epinephrine, and norepinephrine </li></ul></ul>
  195. 275. Fig. 10.17
  196. 276. Fig. 10.18
  197. 277. The Adrenal Cortex <ul><li>Mineralocorticoid- </li></ul><ul><li>Aldosterone </li></ul><ul><ul><li>Increases sodium retention, water retention secondarily </li></ul></ul><ul><ul><li>Causes excretion of potassium </li></ul></ul>
  198. 278. The Adrenal Cortex <ul><li>Glucocorticoids- cortisol </li></ul><ul><ul><li>Increases fat and protein breakdown </li></ul></ul><ul><ul><li>Increases glucose synthesis </li></ul></ul><ul><ul><li>Inhibit inflammation and immune response </li></ul></ul>
  199. 279. The Adrenal Cortex <ul><li>Adrenal androgens </li></ul><ul><li>Estrogens, androgens and progestins </li></ul><ul><li>Insignificant in males </li></ul><ul><li>Increase female sexual drives, pubic hair and axillary hair growth </li></ul>
  200. 280. The pancreas <ul><li>The