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The Endowment for Human Development
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The Embryonic Period


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: 在受精後的頭8週, 發育中的人稱為胚胎, 意思是"在里面成長"。 這段時間稱為胚胎期, 其特點是形成 大部分主要身體系統。

All ages referenced to fertilization, not last menstrual period.
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Reflexive Movement
Reflexive Movement
Epidermis and Hair
Epidermis and Hair
The Embryonic Period
The Embryonic Period
End of Embryonic Period
End of Embryonic Period
Kidneys Produce Urine
Kidneys Produce Urine
Eyelid Fusion
Eyelid Fusion
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