myelin sheath

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myelin sheath

n.
The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and facilitates the transmission of nerve impulses. In the peripheral nervous system, the sheath is formed from the membranes of Schwann cells, and in the central nervous system it is formed from oligodendrocytes. Also called medullary sheath.

my′elin sheath`


n.
a discontinuous wrapping of myelin around certain nerve axons, serving to speed nerve impulses to muscles and other effectors.
[1895–1900]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.myelin sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibersmyelin sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
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
Translations
myelinová pochva
References in periodicals archive ?
Medullated nerve fibres could be seen as white streaks converging on optic disc in two Great Danes, one GSD and one Cocker Spaniel in our studies.
On ophthalmologic examination, retinal medullated nerve fibres were seen in the inferotemporal retina of left eye and in the superior as well as inferior sectors of the retina of right eye.
It has been explored that medullated nerve fibres are a sign of Gorlin's syndrome - a feature of which is intracranial calcification.