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The Endowment for Human Development
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The Folding of the Embryo


3 weeks

From The Biology of Prenatal Development.Buy Now

Script: 在3至4周之间, 横靠卵黄囊 很容易鉴别 胚胎的 头脑、脊髓 和心脏, 身体横剖型线图 显出。

快速生长造成 比较扁平的胚胎折叠。 这个过程使 部分卵黄囊 成为消化系统的衬里, 形成 发育中的 人的胸腔 和腹腔。

4周

All ages referenced to fertilization, not last menstrual period.
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Human Development
Human Development
Heart and Circulatory System
Heart and Circulatory System
The Folding of the Embryo
The Folding of the Embryo
The Folding of the Embryo
The Folding of the Embryo
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The Embryo and Yolk Sac
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