1. Functions Sensory – gather info from inside and outside the body
Integrative – receive the info and decide what to do about it
Motor – respond to the info

3. Cellular Structure Neurons – structural and functional unit
Cell Body – cytoplasm and most organelles
Dendrites – short, highly branched, bring in info
Axons – long, sends impulse away from cell body
Axon Terminal – releases neurotransmitters (chemical signals for the next cell)

4. Neuroglial cells (support cells)
Schwann cells – around axons (PNS)
Produce myelin - a lipoprotein that insulates axon to keep impulses in
Nodes of Ranvier – narrow gaps in the myelin sheath

5. -Astrocytes – star shaped, structural support, scar tissue -Oligodendrocytes – form myelin in brain and spinal cord

6. -Microglial cells – CNS, support, phagocytize bacteria and cell debris -Ependymal cells – covers and lines CNS