胚体 (拉丁文中是conceptio，由合子发育而来)是胚胎以及其附属构造(相邻的部分)或相关的膜[1]。胚体包括所有从合子发育来的构造，即包含胚胎以及胚胎外的构造。这些构造有胎盘、各种囊(卵黄囊、尿囊、羊膜)
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