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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週之間, 橫靠卵黃囊 很容易鑒別 胚胎的 頭腦、脊髓 和心臟, 身體橫剖型線圖顯出。

快速生長造成 比較扁平的胚胎折疊。 這個過程使 部份卵黃囊 成為消化系統 的襯裏, 形成發育中的人 的胸腔 和腹腔。

4週

All ages referenced to fertilization, not last menstrual period.
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