. The anatomy of the domestic animals. Veterinary anatomy. 412 DIGESTIVE SYSTEM OF THE HORSE othelial cells, and is moistened by the peritoneal fluid. Friction is thus reduced to a minimum during the movements of the viscera. The outer surface of the peri- toneum is related to the subserous tissue, which attaches it to the abdominal wall or the viscera. In order to understand the general disposition of the peritoneum, we may imagine the abdominal cavity to be empty and lined by a simple layer of perito- neum, termed the parietal layer (Lamina parietalis). We may further imagine the organs as b
. The anatomy of the domestic animals. Veterinary anatomy. 412 DIGESTIVE SYSTEM OF THE HORSE othelial cells, and is moistened by the peritoneal fluid. Friction is thus reduced to a minimum during the movements of the viscera. The outer surface of the peri- toneum is related to the subserous tissue, which attaches it to the abdominal wall or the viscera. In order to understand the general disposition of the peritoneum, we may imagine the abdominal cavity to be empty and lined by a simple layer of perito- neum, termed the parietal layer (Lamina parietalis). We may further imagine the organs as beginning to develop in the subserous tissue, enlarging, and migrat- ing into the abdominal cavity to a varying extent. In doing so they carry the per- itoneum before them, producing introversion of the simple sac, and forming folds which connect them with the wall or Math each other. The viscera thus receive a complete or partial covering of peritoneum, termed the visceral layer (Lamina visceralis). The connecting folds are termed omenta, mesenteries, ligaments, etc. They contain a varying quantity of coimective tissue, fat, and lymph glands, and furnish a path for the vessels and nerves of the viscera. Some contain unstriped muscular tissue. An omentum is a fold which passes from the stomach to other viscera. There are three of these, namely: (1) Thelesser omentum (Omentum minus),^ which passes from the lesser curvature of the stomach to the liver; (2) the gastro-splenic omentum (Ligamentum gastrolienale), which ex- tends from the greater curvature of the stomach to the spleen; (3) the greater omentum (Omen- tum majus),^ which passes from the greater curva- ture of the stomach and from the spleen to the terminal part of the great colon and the origin of the small colon. It does not pass directly from one organ to the other, but forms an extensive loose sac (ligs. 377, 378). A mesentery (Mesen- terium) is a fold which attaches the intestine to the dorsal wall of the abdomen. Th
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