1. The Nervous System
Ch 33 AND Ch 34

2. Electron Micrograph of Neurons

3. Main Divisions of the Nervous System

4. Central Nervous System
All nerves in the brain & spinal cord (runs from brain to tailbone).

5. Peripheral Nervous System
The PNS, consists of the nerves and neurons that reside or extend outside the central nervous system
It is divided into two further divisions:
somatic nervous system
autonomic nervous system

6. Organization of the Nervous System

7. Parts of a Neuron

8. Neuron Anatomy
1. Dendrites:
2. Cell Body: 3.
Axon:

9. 4. Axon Terminals:
5. Myelin Sheath:
6. Synapse:

10. The Physiology of the Nervous System
Resting Potential
Action Potential
Synapses

11. Resting Potential

13. Moving the Impulse- The Action Potential

14. Channel Gating during an action potential

15. Action Potential- all or none
Step 1
Step 2 (Depolarization)
Step 3 (Repolarization)

17. Fig 33.7

18. Recharging the membrane

19. Propagation of the action potential.

21. Synapses

22. What happens at the axon terminals?