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What is myelination:
Formation of a multilayers lipid/protein covering around axons.
Function of myelin
Insulates the axon and increases speed of nerve impulses
What are unmyelinated axons
Axons without a myelin sheath
Myelin in the PNS is made by
Schwann Cells
Myelin in the CNS is made by
Oligodendrocytes
Do Schwann cells have neurolemma?
Yes (Oligodendrocytes do not)
PNS injury repair is better because…
Schwann cells/neurolemma guide regrowth
CNS injury repair is limited because….
Oligodendrocytes lack a neurolemma, inhibitory glial factors, scar tissue and lack of growth factors.
Nodes of Ranvier are more common in…
PNS Myelinated axons
CNS Axons have little growth after injury because…
Oligodendrocytes lack neurolemma and CNS environment inhibits regeneration