| 单词 |
placode |
| 释义 |
placode Embryol.|ˈplækəʊd|
[ad. G. plakode (C. von Kupffer 1894, in Sitzungsber. der k. bayerischen Akad. der Wissensch. zu München (Math.-phys. Classe) XXIV. 57), f. Gr. πλακώδης laminated, flaky.]
A localized thickening of the ectoderm in a vertebrate embryo which contributes to the formation of a sensory organ or ganglial tissue.
1909Bailey & Miller Text-bk. Embryol. xvi. 459 In the case of the special sense organs there is an interesting tendency on the part of portions of the neural tube, either evaginations (optic vesicles, olfactory bulbs), or ganglia, to fuse with ectodermal thickenings (placodes) at the site of the future sense organs. 1927W. Shumway Vertebr. Embryol. vii. 186 Of the three sensory placodes, olfactory, optic, and otic, the optic placode is incorporated and invaginates with the neural plate so that the eye appears to originate from the brain. 1960Jrnl. Compar. Neurol. CXIV. 11/1 It now seems well established that the placodes provide a distinct cellular contribution to the developing ganglia of the V, VII, IX and X nerves in mammals, just as has long been accepted in fish and amphibians. 1977Proc. R. Soc. Med. LXX. 809/1 The otic placode appears at 21–24 days (Fig 10), and sinks below the surface as a vesicle which lies in undifferentiated mesenchyme. |
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。
相关内容：
相关热词搜索：placode英英词典英英释义英语词汇意思用法释义英语
字词 饱和限制 释义 【电】 saturation limiting 汉译英翻译词典收录405719条汉英翻译词条，基......