Additional Images
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Surface view of embryo of Hylobates concolor.
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Human embryo—length, 2 mm. Dorsal view, with the amnion laid open. X 30.
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Dorsum of human embryo, 2.11 mm. in length.
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Section through the embryo.
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Diagram showing earliest observed stage of human ovum.
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Diagram illustrating early formation of allantois and differentiation of body-stalk.
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Diagram showing later stage of allantoic development with commencing constriction of the yolk-sac.
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Diagram illustrating a later stage in the development of the umbilical cord.
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Fetus of about eight weeks, enclosed in the amnion. Magnified a little over two diameters.
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Model of human embryo 1.3 mm. long.
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Section through ovum imbedded in the uterine decidua
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Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section.
Read more about this topic: Yolk Sac
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