. The biology of the frog. Frogs. 142 THE BIOLOGY OF THE FROG lively large animals the frog is capable of swallowing. The inner surface is thrown into longitudinal folds which extend also into the stomach. There is no sharp line of de- marcation separating the esophagus from the pharynx on the one hand and from the stomach on the other. The anterior end of the stomach is considerably wider than the esophagus, and the organ1 tapers gradu- ally to the posterior or py- loric end, where it is sepa- rated by a constriction, the pylorus, from the small in- testine. The stomach lies mainly in the lef
. The biology of the frog. Frogs. 142 THE BIOLOGY OF THE FROG lively large animals the frog is capable of swallowing. The inner surface is thrown into longitudinal folds which extend also into the stomach. There is no sharp line of de- marcation separating the esophagus from the pharynx on the one hand and from the stomach on the other. The anterior end of the stomach is considerably wider than the esophagus, and the organ1 tapers gradu- ally to the posterior or py- loric end, where it is sepa- rated by a constriction, the pylorus, from the small in- testine. The stomach lies mainly in the left half of the body, and is curved so that the convex side is toward the left. It is suspended dorsally by a fold of peri- toneum, the mesogaster, and from the ventral side arises a second sheet of peritoneum (the gastro-hepato-duodenal ligament), which extends to the duodenum and liver. The wall of the stomach is much thicker than that of the esopha- gus or the intestine. The inner surface is thrown into several longitudinal folds, which become less prominent posteriorly, and near the pyloric end entirely Fig. 49.—Alimentary canal of Rana esculenta. A, opening of the rectum into the cloaca, CI; Duy duodenum; D, ileum; t> boundary between the latter and the large intestine, R; HB, urinary bladder ; M, stomach ; Mz, spleen ; Oe, esophagus; Pyy pylorus. (After Wiedersheim.). 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 Holmes, Samuel J. (Samuel Jackson), 1868-. New York : The Macmillan company
Size: 1097px × 2278px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorholmessamueljsamuelja, bookcentury1900, bookdecade1920
