A&P Final: Myelination

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Last updated 9:39 PM on 5/3/26
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10 Terms

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What is myelination:

Formation of a multilayers lipid/protein covering around axons.

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Function of myelin

Insulates the axon and increases speed of nerve impulses

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What are unmyelinated axons

Axons without a myelin sheath

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Myelin in the PNS is made by

Schwann Cells

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Myelin in the CNS is made by

Oligodendrocytes

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Do Schwann cells have neurolemma?

Yes (Oligodendrocytes do not)

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PNS injury repair is better because…

Schwann cells/neurolemma guide regrowth

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CNS injury repair is limited because….

Oligodendrocytes lack a neurolemma, inhibitory glial factors, scar tissue and lack of growth factors.

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Nodes of Ranvier are more common in…

PNS Myelinated axons

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CNS Axons have little growth after injury because…

Oligodendrocytes lack neurolemma and CNS environment inhibits regeneration