Neurolemma

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Neurolemma
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Diagram of longitudinal sections of medullated nerve fibers.
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Transverse sections of medullated nerve fibers.
Gray's subject #183 727
MeSH A08.561.600


Overview

Neurolemma (also neurilemma and sheath of Schwann) is the outermost layer of nerve fibers in the peripheral nervous system. It is a nucleated cytoplasmic layer of Schwann cells that surrounds the myelin sheath of axons.

Unlike the axon and the myelin sheath, the neurolemma does not degenerate after a nerve has been cut or crushed; the hollow tube formed by the neurolemma is instrumental in regenerating the nerve fiber. It is important to note that in CNS, axons are myelinated by oligodendrocytes, thus lack neurolemma.

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