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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: 八週標示胚胎期結束。

在這段時間, 人類胚胎 從一個細胞 生長成將近 10億個細胞, 它們形成4,000 多種解剖結構。

現在胚胎擁有 成年人的90%以上的結構。

All ages referenced to fertilization, not last menstrual period.
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