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来自维基百科,自由的百科全书
人类胚胎发育[1]是指人类胚胎的形成和发育。当精子成功进入卵细胞并与卵细胞融合时,就会出現受精。然后便會形成受精卵,此後便意味著胚胎開始發育。當人類的人类胚胎发育至第九周时,此時的胚胎開始被称为胎兒。胚胎發育的前八周共要經歷23個階段。人類的妊娠期一共要9個月或者40周。
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