medullary sheath

medullary sheath

n.

See myelin sheath.

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medullary sheath

n

1. (Life Sciences & Allied Applications / Anatomy) Anatomy a myelin layer surrounding and insulating certain nerve fibres

2. (Life Sciences & Allied Applications / Botany) a layer of thick-walled cells surrounding the pith of the stems of some higher plants

Thesaurus

Noun

1.

medullary sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers myelin sheath sheath, case - an enveloping structure or covering enclosing an animal or plant organ or part axolemma - outer membrane covering an axon medullated nerve fiber, myelinated nerve fiber - a nerve fiber encased in a sheath of myelin nodes of Ranvier, Ranvier's nodes - small gaps in the myelin sheath of medullated axons oligodendria, oligodendroglia - tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers medulla, myelin, myeline - a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers