| 单词 | medullary sheath |
| 释义 | medullary sheathnounBotany. a narrow zone made up of the innermost layer of woody tissue immediately surrounding the pith in plants. Anatomy. myelin sheath. Origin of medullary sheathFirst recorded in 1840–50 Words nearby medullary sheathmedullary groove, medullary membrane, medullary plate, medullary pyramid, medullary ray, medullary sheath, medullary space, medullary sponge kidney, medullary stria of fourth ventricle, medullary stria of thalamus, medullary substance Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for medullary sheathmedullary sheath nounanatomy a myelin layer surrounding and insulating certain nerve fibres a layer of thick-walled cells surrounding the pith of the stems of some higher plants Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for medullary sheathmedullary sheath n.myelin sheath The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. |
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