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colleen colleen
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Posts: 17077
11 years ago
Nerve fibers of the peripheral nervous system are wrapped by protective membranes. Name the two membranes and describe each.
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11 years ago
In the PNS there are two types of sheaths: myelinated and unmyelinated, which are formed by accessory cells. Myelinated fibers have an inner sheath of myelin, a thick fatty substance, as well as an outer sheath, or neurilemma composed of Schwann cells. Unmyelinated fibers lack myelin and are only sheathed by the neurilemma.
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