01 CNS Cells

Gial Cells

  • non neuron 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

  • HIV hide in microglia

Oligodendroglia

  • aka oligodendrocytes

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

  • fingertips

Pacinian

Merkel

Peripheral Nerves

  • Nerve trunk
  • fasciculus: made up of small nerves
  • endoneurium inflammed in GBS