Class 14: Communication in the Nervous System (Outline)

[snort] [runners] Wounded Soldier 

  [MS]  [Nerve Gas]  [No-L-ITA]

1. Nervous Tissue: The Basic Hardware



Glia (="Glue")

Glial Cells

2. The Neural Impulse: Using Energy to Send Information

A. The Neuron at Rest = A Tiny Battery

Resting Potential of Neuron


B. The Action Potential = Movement of Ions In/Out of Neuron

Action Potential

C. All-or-None Law

[All-or-Nothing Law]

3. The Synapse: Where Neurons Meet

  • Synaptic Cleft
  • Synaptic Vesicles
  • Neurotransmitters
  • Receptor Sites
  • Re-uptake channels
  • PSP (Post-synaptic potentials)
    • Excitatory
    • Inhibitory
  • Integrating signals in neural networks
    • neural networks sculpted by elimination of old synapses = synaptic pruning

4. Neurotransmitters and Behavior

A. Acetylcholine (Ach)
B. Monoamines

1. Dopamine (DA)
2. Norepinepherine (NE)
3. Serotonin (5-HT)

(Pert & Snyder)C. GABA & Glutamate (amino acids)

1. GABA (inhibitory PSPs)
2. Glutamate (excitatory PSPs)

C. Endorphins