The mesonephros processed towards the tail with days increasing. At E29d the metanephros appeared renal.
前肾出现的时间很短，很快分化成中肾；22d胚胎的中肾呈香蕉状，随胚胎日龄的增加逐渐向胚体尾端推移;胚胎29d时，后肾呈椭圆形。
参考来源 - 海门山羊早期胚胎形态观察及泌尿生殖器官发生的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
N the middle part of the embryonic kidney in vertebrates, becoming the adult kidney in fishes and amphibians and the epididymis in reptiles, birds, and mammals 中肾 → see also pronephros, metanephros
The development of the kidney, the major excretory organ after birth, consists of 3 stages:the pronephros, mesonephros and metanephros.
肾脏是人体主要的排泄器官，它的发育经过原肾、中肾、后肾3个阶段。
Objective: to observe the development of mesonephros and the expression of growth factors and their receptors in human embryo of 3th-8th weeks.
目的：观察第3 ~ 8周人胚中肾的发育和生长因子及其受体的表达。
Objective To explore the role of aorta-gonad-mesonephros(AGM)-derived stromal cells in promoting the differentiation of embryonic stem cells(ESCs) into hemangioblasts.
目的探讨主动脉-性腺-中肾（AGM）区来源的基质细胞诱导胚胎干细胞（ESC）向成血-血管干细胞分化的促进作用。
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