01 CNS Cells
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Gial Cells
Neurons
AP
- at rest: high Na concentration outside cell, K leak out constantly maintain -70
- depolarize: Na open, raise voltage. More channels open down the axon
- At end of cell, Ca channels open, NT released
- depolarization: Na in
- repolarization: K out
Astrocytes
- repair, scar, clean up NT
Microglia
Oligodendroglia
Schwann
Myelin
- conduction velocity: speed at which electricity go down
- length constant: how far go down neuron until 1/3 left of original strength
Nerve Fibers
- small fibers easier blocked by Na blockers (no pain but still touch)
Sensory Nerves
Free Nerve
Meissner
Pacinian
Merkel
Peripheral Nerves
- Nerve trunk
- fasciculus: made up of small nerves
- endoneurium inflammed in GBS
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