Try Our Apps
Dictionary.com

follow Dictionary.com

2017 Word of the Year

myelin sheath

noun, Anatomy.
1.
a wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.
Origin of myelin sheath
1895-1900
First recorded in 1895-1900
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
myelin sheath in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Word of the Day

Nearby words for myelin sheath

Word Value for myelin

11
13
Scrabble Words With Friends