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Myelin sheath

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.05 sec.
myelin sheath
n.
The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses, formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells. Also called medullary sheath.
Myelin sheath
The cover that surrounds many nerve cells and helps to increase the speed by which information travels along the nerve.
Mentioned in: Acoustic Neuroma
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