1. dendrites axon cell body myelin

2. Perkins & Kent (1991)

3. Figure 4-25. The dendrites of one neuron synapsing with the axon of an adjacent neuron. Reprinted from Denes and Pinson, The Speech Chain, 1993, W.H. Freeman & Co. Synapse: A tiny space between the axon of one fiber and the dendrites of another. Neuro- transmitter chemicals that are released into the synapse stimulate the adjacent fiber to fire (depolarize).

4. Axon hillock: Action potentials originate here and propagate along the length of the axon.

5. Stimulus: (1) Uptake of neurotransmitter chemical at the neuron’s dendrites, (2) an artificial electrical stimulus.

7. Nerve propagation Action potential

8. Action Potential

9. Better Picture of an Action Potential (This one moves.) Notice that this figure shows a voltage swing from -70 to +30.