File:Hertig1945d fig16.jpg
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Fig. 16. A maid-cross section of the embryo and adjacent chorion of a 14-day ovum
The amniotic cavity is now a flattened cone and is completely enclosed by the thin amniotic membrane above and the primitive ectoderm below. The yolk-sac has now appeared and has already outstripped the amniotic cavity in size although the former has probably not been present for more than 36 ours.
Carnegie 7801, section 12-1-3, X 100.
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