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Integumentary System.pptx

  1. Regulation of body temperature Blood reservoir Protection Cutaneous sensations Excretion and Absorption Synthesis of Vitamin D
  2.  The skin (cutaneous membrane) covers the body and is the largest organ of the body by surface area and weight.  Its area is about 2 square meters and weighs 4.5-5kg, about 16% of body weight.  It is 0.5 – 4 mm thick, thinnest on the eyelids, thickest on the heels.
  3. It consists of two major layers: Outer, Thinner layer called the Epidermis, consists of epithelial tissue. Inner, thicker layer called the Dermis. Beneath the dermis is a subcutaneous layer (also called Hypodermis) which attaches the skin to the underlying tissues and organs.
  4. Components of the Integumentary System
  5. Epidermis The epidermis contains five major layers: oStratum basale-Forms epidermal ridges(fingerprints) oStratum spinosum-Spiny Layer oStratum granulosum-Grainy Layer oStratum lucidum-Clear Layer oStratum corneum-Horn Layer
  6. Dermis The dermis is composed of connective tissue containing collagen and elastic fibers. Hypodermis Subcutaneous layer (also called hypodermis) is not part of the skin but, among its functions, it attaches the skin to the underlying tissues and organs.
  7. Include  Hair  Skin Glands  Nails
  8. Hair is composed of dead, keratinized epidermal cells. Hairs have a number of important functions:  protection  reduction of heat loss  sensing light touch
  9. Nails Nails are composed of hard, keratinized epidermal cells located over the dorsal surfaces of the ends of fingers and toes. Each nail consists of:  free edge  transparent nail body (plate) with a whitish lunula at its base  nail root embedded in a fold of skin.
  10. Reference  Textbook of Human Anatomy and Physiology- Dr. Sushma Devi; Pg 136- 145  Ross and Wilson Anatomy and Physiology; 13th edition; Pg 30-32  A.K.Jain  C.L.Ghai  Wikipedia   NCBI Bookshelf  Slideshare
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