. Chordate morphology. Morphology (Animals); Chordata. diaphragm gall bladde duodenal bulb with Brunner's gland hepatic portal vein colonic loop —large intestine outline (dashed line) of omentum- colonic loop--^ B. Figure 9-3. Ventral views of the digestive tract of the Platypus. (A, after Owen 1866; B, after Mitchell, 1905) ner's glands characterize the duodenum of higher forms, this has been called the duodenal bulb. From here the gut continues a short distance to the common entrance of the bile and pancreatic ducts. The pancreas lies entirely in the mesentery of the duodenal arc. The duoden
. Chordate morphology. Morphology (Animals); Chordata. diaphragm gall bladde duodenal bulb with Brunner's gland hepatic portal vein colonic loop —large intestine outline (dashed line) of omentum- colonic loop--^ B. Figure 9-3. Ventral views of the digestive tract of the Platypus. (A, after Owen 1866; B, after Mitchell, 1905) ner's glands characterize the duodenum of higher forms, this has been called the duodenal bulb. From here the gut continues a short distance to the common entrance of the bile and pancreatic ducts. The pancreas lies entirely in the mesentery of the duodenal arc. The duodenal arc extends first to the right, then back to the left above the hepatic portal vein (Figure 9-3) and next to the dorsal body wall, where it is attached by the cavo- duodenal ligament. The remainder of the small intestine, Meckel's tract, is very looped and folded; it joins the large intestine at the ventroposterior margin of the gut mass with- out an ileocolic valve. The large intestine has a slim caecum projecting back along the small intestine; it extends ante- riorly below the coils of the small intestine, forms a colonic loop, then passes dorsally anterior and joins with the ter- minal part of the duodenum; from here it turns posteriorly to the cloaca above the loops of the small intestine. The marsupial, as represented by the opossum, is much like the monotreme (Figure 9-4). The stomach of members of this group shows much variation and specialization, but in the opossum it is a simple large sac (Figure 9-5). It opens to the right of the esophagus into a sacculate duodenum. The bile duct is a short, thick tube which opens into the gut a short distance from the stomach. The duodenal loop passes dorsally across the body cavity to the looped Meckel's tract. The small intestine enters the large intestine ventrally and just behind the stomach. The large intestine has a large but simple caecum. In Thalaanus or Notorycles, a caecum and ileocolic valve are lacking. The large i
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