Neurilemma Definition

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Neurilemma: The outermost part of the ectodermal sheath of myelinated nerve fibers, including the sheath cell nucleus and its cytoplasm but not the concentric myelin-containing lamellae. Multiple nonmyelinated fibers may be contained within a single neurolemma sheath. (Lockard, Desk Reference for Neuroscience, 2d ed)

Synonym: neurolemma.