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1. (n.) myelin sheath
a discontinuous wrapping of myelin around certain nerve axons, serving to speed nerve impulses to muscles and other effectors.
Etymology: (1895–1900)
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| Definition of 'myelin sheath' |
Princeton's WordNet |
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1. (noun) medullary sheath, myelin sheath
a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
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| Definition of 'myelin sheath' |
U.S. National Library of Medicine |
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1. myelin sheath
The lipid-rich sheath surrounding AXONS in both the central and peripheral nervous systems. The myelin sheath is an electrical insulator and allows faster and more energetically efficient conduction of impulses. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). Deterioration of the sheath in DEMYELINATING DISEASES is a serious clinical problem.
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Definitions of myelin sheath 
