1. THE NERVOUS SYSTEM I pp. 1003-1015
Warm-up 4/9: What are the 4 main types of tissues. Describe each.
THE NERVOUS SYSTEM I pp

2. FUNCTION
network of cells (neurons) that communicate and control the body through electrical impulses
Includes neurons (cells that carry messages), brain and spinal cord

4. CENTRAL NERVOUS SYSTEM CNS
Brain – control center with different sections controlling different parts of the body
Spinal cord – column of nerve tissue that acts as a communication link between brain and Peripheral NS.

5. PERIPHERAL NERVOUS SYSTEM PNS
carries impulses to and from the CNS.
Motor division (reacts to sensory input)
1. somatic nervous system (voluntary):
transmits impulses to and from skeletal
muscle

6. 2. Autonomic nervous system (involuntary) – controls glands, internal organs, and other smooth muscle tissue.

7. NEURONS

8. 1. Axons: extension of cell body
2. Axon terminal: end of the axon
3. Dendrites: receive action potentials (electrical impulse/message) from other neurons
4. Synapse: gap between neurons
5. Myelin sheath: lipid layer around axon (insulator)
6. Schwann cells: produce myelin sheath

9. TYPES OF NEURONS sensory – sense organs/receptors to CNS.
motor – CNS to muscles/glands.
interneurons – connect sensory and motor and carry impulses between them.

10. homework
Cover Page Physio
Read pp
P 1015 # 1-6, 8