. Contributions to embryology. Embryology. A Ht'MAN EMBHYO OF TWKNTY-FOtH I'AIKS OF SOMITES. 187 short of reaching the octodoriii. A fourth pouch is seen extending from the ventro-lateral surface of the pharynx. It arises to a certain extent in common with the third, and shares with it the third ventral pharyngeal groove. It is slightly pointed and is directed outward, backward, and downward. The remaining jjortion of the foregut, that is, that part between the fourth pharyngeal pouch and the yolk-stalk, is shown in plate 3, figures 3 and 4. It liresents, above, a definite swelling which is ap
. Contributions to embryology. Embryology. A Ht'MAN EMBHYO OF TWKNTY-FOtH I'AIKS OF SOMITES. 187 short of reaching the octodoriii. A fourth pouch is seen extending from the ventro-lateral surface of the pharynx. It arises to a certain extent in common with the third, and shares with it the third ventral pharyngeal groove. It is slightly pointed and is directed outward, backward, and downward. The remaining jjortion of the foregut, that is, that part between the fourth pharyngeal pouch and the yolk-stalk, is shown in plate 3, figures 3 and 4. It liresents, above, a definite swelling which is apparent when seen in either front or side view. Looked at from in front, the swelling appears double, a median longitudinal groove separating two rather elongated protuberances. A cross- section of this region is shown in text-figure 2. A .short distance below this swelhng there is another which, when viewed from the side, is seen to be rather pointed. It is just dorsal to the sinus venosus (text-fig. 3). Still farther caudally is seen the hepatic diverticulum (text-fig. 5). 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 Carnegie Institution of Washington. Washington, D. C
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