Outlines of Zoology

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(a) The Amnion. At an early stage in development the head end of the embryo seems to sink into the subjacent yolk. A semilunar fold of the blastoderm, including epiblast and mesoblast, rises up in front. Similar folds appear laterally. All the folds increase in size, arch up- wards, and unite above, forming a dome over the embryo. Each of these folds is double ; the inner limbs unite to form " the true amnion " ; the outer limbs unite to form "the false amnion, " "serous membrane, " or subzonal
... membrane. The cavity bounded by the true amnion contains an amniotic fluid bathing the outer surface of the embryo ; the cavity between the true and the false amnion is lined by mesoblast, and is continuous with the pleuro-peritoneal or body cavity of the embryo. The amniotic folds extend not only over the embryo, but ventrally around the yolk-sac, which they completely invest.
(b) The Allantois. While the amnion is being formed, a sac grows out from the hind end of the embryonic gut. This is the allantois lined internally by hypoblast, externally by mesoblast.


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