| 单词 | medullary sheath |
| 释义 | > as lemmasmedullary sheath medullary sheath n. (a) Botany. [compare French étui médullaire (1812)] , (in some higher plants) a layer of cells surrounding the pith of the stem; (b) Histology and Physiology = myelin sheath n. at myelin n.2 Compounds (now rare). ΚΠ 1816 P. Keith Syst. Physiol. Bot. I. 324 The circular row of longitudinal fibres, known by the appellation of the Medullary Sheath. 1861 Philos. Trans. 1860 (Royal Soc.) 150 617 There is no tubular membrane, medullary sheath, or axis cylinder to be demonstrated. 1884 F. O. Bower & D. H. Scott tr. H. A. de Bary Compar. Anat. Phanerogams & Ferns 603 The consequent splitting and disrupture of the medullary sheath. 1939 T. L. Green Pract. Animal Biol. iii. 246 Medullated nerve fibres consisting of a central axis-cylinder surrounded by the medullary sheath and in some nerves by an external sheath or neurolemma. 1995 Physiologia Plantarum 95 379 Part of the 35S translocated was stored in ray cells, medullary sheath cells and/or pith parenchyma cells. < as lemmas |
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