medullary sheath

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Noun medullary sheath has 1 sense

medullary sheath, myelin sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
--₁ is a kind of sheath, case
--₁ is a part of medullated nerve fiber, myelinated nerve fiber
--₁ has parts:
axolemma; Ranvier's nodes, nodes of Ranvier; oligodendroglia, oligodendria
--₁ has substances: myelin, myeline, medulla

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