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myelin sheath
my·e·lin sheath (plural my·e·lin sheaths)


noun 
Definition:
 
nerve-insulating layer: a layer of myelin that insulates some nerve cells. In multiple sclerosis, the myelin sheath is damaged and the nerve impulse is impaired.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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