medullary sheath


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medullary 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.

medullary sheath

n
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

med′ullary sheath′


n.
1. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants.
[1840–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.medullary sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibersmedullary sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
sheath, case - an enveloping structure or covering enclosing an animal or plant organ or part
axolemma - outer membrane covering an axon
medullated nerve fiber, myelinated nerve fiber - a nerve fiber encased in a sheath of myelin
nodes of Ranvier, Ranvier's nodes - small gaps in the myelin sheath of medullated axons
oligodendria, oligodendroglia - tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers
medulla, myelin, myeline - a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
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