2. Central NervousSystem

3. Brain

4. The Brain The brain is the primary organ of the central nervous system contained within the skull. It receives and interprets the countless signals that are sent to it from other parts of the body and from the external environment. The brain makes us conscious , emotional and intelligent. It is the control center for movement, sleep, hunger, thirst, and every vital activity necessary to survival. The brain controls all human emotions like love, hate, fear, anger, elation, and sadness.

5. The adult human brain is a 1.3 –kg (3-lb) mass of pinkish-gray jellylike tissue made up of approximately 100 billion nerve cells or neurons. The brain is divided into three parts: the cerebrum, the cerebellum, and the brain stem. Different areas of the brain control specific activities.

6. Cerebrum or the forebrain is the largest part of the brain. It is responsible for the higher thought processes such as memory, judgment, and reason. Cerebrum

8. Left and Right Hemisphere

9. Gyri and Sulci

10. Parts of the Brain

11. Cerebellum The cerebellum is at the back of the brain stem and is linked to it by nerve tracts. It receives information from muscle tendons and the balance organ in the inner ear. It is concerned with the maintenance of posture and balance , and the coordination of movements.

12. Parts of the Brain Stem: Medulla Pons Midbrains

13. Spinal Cord It is a cylinder of nerve tissue as thick as finger and about 45 cm long. Coming out of the spinal cord on both sides and at regular intervals are the spinal nerve roots. The spinal nerves branch out to reach different parts of the body.

14. Neuron It is the basic unit of structure and function of the nervous system

16. Cell Body

17. Dendrites

18. Synapse

20. Peripheral NervousSystem 2 divisions: Motor Division (efferent): somatic and autonomic division Sensory Division ( affarent) : sense organs

21. Somatic Nervous SystemFirst component of Peripheral Nervous System

22. Autonomic Nervous System

23. Diseases of Nervous System Meningitis Poliomyelitis Neuritis Tumor Migraine Skull Fracture Concussion Cerebral Constusions and Laceration Multiple Sclerosis Polio Stroke Rabies Enephalitis