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Noun medullary sheath has 1 sense
  1. 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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