Chapter 12 Conduction Myelin Sheath insulates neurons Oligodendrocytes in CNS Schwann cells in PNS Occurs in 14th weeks of fetal development Rapid during infancy Complete in adolescence Neurilemma thick outer layer of Schwann cells 80 lipid 20 protein Unmyelinated neurons Schwann cell holds multiple axons together Conduction Diameter Conduction speed
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