. The biology of the frog . i. Fig. 38. — Alimentary canal of Rana es-culenta. A, opening of the rectum intothe cloaca, CI; Du, duodenum; D,ileum; f, boundary between the lat-ter and the large intestine, R ; ///?,urinary bladder; M, stomach ; Mz,spleen ; Oe, esophagus; Py, pylorus.(After WiediTsheim.) vii THE DIGESTIVE SYSTEM AND ITS FUNCTIONS 139 thicker than that of the esophagus or the intestine. Theinner surface is thrown into several longitudinal folds, whichbecome less prominent posteriorly, and near the pyloric endentirely disappear. In a cross section of the stomach one may observe a v
. The biology of the frog . i. Fig. 38. — Alimentary canal of Rana es-culenta. A, opening of the rectum intothe cloaca, CI; Du, duodenum; D,ileum; f, boundary between the lat-ter and the large intestine, R ; ///?,urinary bladder; M, stomach ; Mz,spleen ; Oe, esophagus; Py, pylorus.(After WiediTsheim.) vii THE DIGESTIVE SYSTEM AND ITS FUNCTIONS 139 thicker than that of the esophagus or the intestine. Theinner surface is thrown into several longitudinal folds, whichbecome less prominent posteriorly, and near the pyloric endentirely disappear. In a cross section of the stomach one may observe a verythin outer layer composed of much flattened cells; this isthe serous coat or serosa, and it is formed by the the serosa is a thicker layer, the subserosa, consistingmainly of connective tissue. This layer has been frequentlydescribed as a layer of longitudinal muscles, and it has theappearance of such; but if treated with the proper stains,it can readily be shown to be mainly connective write
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