. Embryology. Embryology; Embryology; genealogy. POSTERIOR FOLD ALLANTOIS. Fig. 111. The formation of the embryo digestive tract, the yolk sac, and the allantois. Top: The endo- derm first arises as a flat sheet of cells. Center: The endoderm grows over the surface of the yolk. In the embryonic area an anterior fold of the endoderm forms the foregut, while a posterior fold forms a hind- gut. The midgut communicates di- rectly with the yolk. Bottom: With lateral folding as described in Fig- ure 103, the opening into the mid- gut becomes constricted and the endoderm of the embryo remains connect
. Embryology. Embryology; Embryology; genealogy. POSTERIOR FOLD ALLANTOIS. Fig. 111. The formation of the embryo digestive tract, the yolk sac, and the allantois. Top: The endo- derm first arises as a flat sheet of cells. Center: The endoderm grows over the surface of the yolk. In the embryonic area an anterior fold of the endoderm forms the foregut, while a posterior fold forms a hind- gut. The midgut communicates di- rectly with the yolk. Bottom: With lateral folding as described in Fig- ure 103, the opening into the mid- gut becomes constricted and the endoderm of the embryo remains connected with the endoderm of the yolk sac through the body stalk. EGG MEMBRANE 186. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press
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