medullary sheath

Noun

1.

medullary sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers Synonyms: myelin sheath

axolemma, case, medulla, medullated nerve fiber, myelin, myelin sheath, myelinated nerve fiber, myeline, nodes of Ranvier, oligodendria, oligodendroglia, Ranvier's nodes, sheath