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The Endowment for Human Development
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End of Embryonic Period


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: 八周标示胚胎期结束。

在这段时间, 人类胚胎 从一个细胞 生长成将近 10亿个细胞, 它们形成4,000 多种解剖结构。

现在胚胎拥有 成年人的90%以上的结构。

All ages referenced to fertilization, not last menstrual period.
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