medullary sheath
a layer of myelin encasing (and insulating) the axons of medullated nerve fibers • Syn: myelin sheath • Hypernyms: sheath, case • Part Holonyms: medullated nerve fiber, myelinated nerve fiber • Substance Meronyms: myelin, myeline, medulla • Part Meronyms: axolemma, Ranvier's nodes, nodes of Ranvier, oligodendroglia, oligodendria
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