1. Nervous System Supplies information about internal and external environment

2. Parts: Brain Spinal cord Nerve fiber Sensory receptors

3. 1 st part of the system: Autonomic nervous system: Controls the automatic functions Respiratory system Digestive system Eyes Heart Blood vessels Glands

4. 2 nd part of the system:  Central Nervous System  Controls Movement Communication Has 2 parts: 1.Spinal cord and brain 1.Peripheral nerves

5. Nerves: Bands of white tissue From central nervous system and ganglia and extend to all parts of the body

6. 2 kinds of nerves: 1.Send impulses to the brain over sensory fibers - 2.Carry commands back from the brain over motor fibers

7. Sense Organs/Receptors: Nerve endings receiving stimuli from the outside

8. General sense organs: Respond to pain, touch, temperature

9. Special Sense Organs: Respond to smell, sight, taste, and hearing

10. Nerves follow the course of the arteries Exp: telephone wires – contain many separate lines in a bundle

11. 3 main parts of the brain: 1.Brain stem 2.Cerebrum 3.Cerebellum

12. Brain Stem (primitive brain) Contains nerve centers that control heartbeat, respiration, temperature, etc…

13. Cerebrum (brain) Performs functions of memory, intelligence, and emotional response

14. Cerebellum: Controls muscular coordination, balance, equilibrium Smaller than cerebrum

15. Ganglia: Secondary nerve centers located along spinal cord Receive and dispatch nerve impulses that do not have to reach the brain Exp: heat, pain, excessive pressure, reflexes