. The comparative anatomy of the domesticated animals. Veterinary anatomy. 382 THE DIGESTIVE APPARATUS IN MAMMALIA. the Fig. THEORETICAL TRANSVERSE SECTION OF THE ABDOMINAL CAVITY, TO SHOW THE DISPOSITION OF THE PERITONEUM. cavity, B that of the aorta, at the level of the great mesenteric artery : peritoneal membrane, oo, covers the walls of the abdomen, and at the points DD (not inserted, but intended to be placed within the cavity below, and on each side of b, the aorta) is folded around the great mesenteric artery in such a manner as to form two layers, ff, which come in contact by th
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 382 THE DIGESTIVE APPARATUS IN MAMMALIA. the Fig. THEORETICAL TRANSVERSE SECTION OF THE ABDOMINAL CAVITY, TO SHOW THE DISPOSITION OF THE PERITONEUM. cavity, B that of the aorta, at the level of the great mesenteric artery : peritoneal membrane, oo, covers the walls of the abdomen, and at the points DD (not inserted, but intended to be placed within the cavity below, and on each side of b, the aorta) is folded around the great mesenteric artery in such a manner as to form two layers, ff, which come in contact by their adherent face, reach the intestine, and then separate to envelop it. We then see in this figure the parietal layer of the peritoneum, cc, the visceral layer, gg, and the two layers, ff, which establish the continuity of the parie- tal and visceral portions; the complete sac formed by these is apparent, and it could be rendered more so by the further separation and development of the layers ff ; so that there is no difficulty in under- standing how the small intestine may be at the same time in the interior of the abdominal cavity, and outside the sac formed by the serous membrane which lines that cavity. This arrangement is common to all the organs freely suspended in the abdomen. The serous folds which suspend them, in joining their peritoneal layer to that which covers the parietes of the cavity, will be studied under the names of ligaments, mesenteries, and omenta. Some organs—the kidneys, for example —have no proper visceral layer, being comprised between the abdominal wall and the external face of the parietal peritoneum, and are invested with none of the duplicatures just mentioned. We will briefly study the duplicatures, ligaments, mesenteries, and omenta that the peritoneum forms, starting from the umbilicus and passing forwards and backwards (Fig. 181). On reaching the suprasternal region, the peritoneum forms a falciform duplicature, extending from the umbilic
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