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See myelin sheath.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Anatomy) anatomy a myelin layer surrounding and insulating certain nerve fibres
2. (Botany) a layer of thick-walled cells surrounding the pith of the stems of some higher plants
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||medullary sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers|
axolemma - outer membrane covering an axon
oligodendria, oligodendroglia - tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers
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