BIOL123 Lecture Notes - Lecture 30: Peripheral Nervous System, Neuropil, Central Nervous System
17 Jun 2018
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• Schwann calls:
o Peripheral nervous system
o Provide myelination of axons in the PNS
o A single cell forms myelin around a segment of one axon (in contrast to the
ability of oligodendrocytes to branch and sheath parts of more than one axon)
o
o Gaps between adjacent cell segments: nodes of Ranvier
o Action potential firing can occur only at nodes of Ranvier
o
• Microglia:
o Central nervous system
o Small cells with short irregular processes
o Evenly distributed throughout grey and white matter
o Originate from circulating blood monocytes
o Migrate through the neuropil and remove damaged cells and invading
microorganisms
o
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