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Section through the middle of the embryo

A section through the middle of the embryo and the immediately surrounding endometrium. The embryo is oriented so that its dorsal aspect is toward the top of the picture. The bilaminar nature of the germ disk is evident. The early primordium of the amniotic cavity appears as a cleft between it and the cytotrophoblast. Early formative cells of the amnion are seen above the amniotic cavity.

Fig. 3. Hertig and Rock, 1945.

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Keywords: amnion, amniotic cavity, bilaminar germ disk, cytotrophoblast, embryo, endometrium, primordium of amniotic cavity

Source: The Virtual Human Embryo.