During the first 3 to 4 days of development in the chick, the extraembryonic part, the yolk-sac, expands to encompass the yolk mass. The yolk-sac, initially a two-layered epithelial sheet, is pulled out by the
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In subject area: Medicine and Dentistry During early development the yolk sac membrane is formed from cells from the extra-embryonic blastoderm, which grow downwards to completely surround the yolk. From: Respiratory Physiology & Neurobiology, 2011 ...
mother. Thus, although the yolk sac in higher mammals may be considered an evolutionary vestige from its yolky-egged ancestors, it still serves important functions in the young embryo. As the embryo ages, the yolk sac shrinks in size, and the allantois takes over the role of nutrition.See...
The regulation of mesoderm formation is discussed in detail by Keller et al. in this issue and has also been recently reviewed in this journal [2]. During gastrulation, mesoderm cells directly contribute to the formation of blood cells in the yolk sac, the heart, and aorta in the embryo ...
chick embryo cell culture鸡胚细胞培养 相似单词 yolk sac卵黄囊 chickn. 1.小鸡,小鸟,幼雏 2.少妇 3.【口】小姐,小妞,女孩,女生 yolkn.[U,C] 蛋黄 embryon. 1.【生】胚,胚胎,(尤指受孕后八周内的)人类胚胎 SACabbr. (英国)皇家空军一等兵(Senior Aircraftman) ...
RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook yolk stalk Thesaurus Medical Encyclopedia n. A narrow ductlike part that connects the yolk sac to the middle of the digestive tract of an embryo. American Heritage® Dictionary of the English Language, Fifth Edi...
membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo 相似短语 yolk sacn.(=yolk bag)[动]卵黄囊 internal yolk sac内卵黄囊 yolk sac tumor of ovary卵巢卵黄囊瘤 ...
chick embryo yolk sac 鸡胚卵黄囊相关短语 milk line (胚) 乳线 torpedo stage (指胚) 鱼雷期 Wagner's spot (胚点) 瓦格纳氏点 late heart stage (指胚) 晚心期 infectious laryngotracheitis (鸡) 传染性喉气管炎 toxic fat syndrome (鸡) 毒脂征 autosexing breed (鸡) 自别雌雄品种 barred factor...
nyema;egg —yema de huevo;— sacsaco vitelino English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. Want to thank TFD for its existence?Tell a friend about us, add a link to this page, or visitthe webmaster's page ...