. The anatomy of the domestic animals. Veterinary anatomy. THE 8MALL INTESTINE 421 between which the vessels and nerves reach the bowel; it also contains the mesen- teric Ij'mph glands and some fat. The visceral border of the mesentery contains the intestine, while the parietal border or root of the mesentery (Radix mesenterii) is attached to a small area around the great mesenteric trunk under the first and second hmil)ar vertelirte. The root is thick, as it contains a large number of vessels and ner\'es placed close together. The mesentery is short at first, bvit soon reaches a length of one
. The anatomy of the domestic animals. Veterinary anatomy. THE 8MALL INTESTINE 421 between which the vessels and nerves reach the bowel; it also contains the mesen- teric Ij'mph glands and some fat. The visceral border of the mesentery contains the intestine, while the parietal border or root of the mesentery (Radix mesenterii) is attached to a small area around the great mesenteric trunk under the first and second hmil)ar vertelirte. The root is thick, as it contains a large number of vessels and ner\'es placed close together. The mesentery is short at first, bvit soon reaches a length of one and a half to two feet (ca. 50 cm.)—sufficient to allow coils of the intestine to reach the abtlominal floor, the pelvic cavity, or even to descend into the scrotum through the inguinal canal. Near its termination the intestine lea\'es the border of the mesentery, so that the latter has a free edge which passes to the ciEcum. Thus there is formed the ileo-cascal fold (Plica ileocsecalis), which at- taches the ileum to the lesser curvature of the ctecum. Structure.—The wall consists of four coats—serous, muscular, submucous, and mucous. The serous coat is complete except at the mesenteric edge, where the vessels and nerves reach the bowel. The muscular coat consists of an external longitudinal and an internal circular layer, tlie latter being the thicker. In the last few feet of the intestine the muscular coat is thick, and being usually firmly contracted in the dead subject, gives the impression that this part of the bowel is of smaller caliber; such, however, is not the case during life. The sub- mucous coat is a layer of areolar tissue in wliich the vessels and nerves ram- ify. It contains also the duodenal glands and the bases of the solitary and aggregated lymph nodules. The mucous membrane is soft and vel- vety. It has a grayish or j-ellowish- red color and is very vascular. Abovit five or six inches from the p}'lorus it forms a pouch, the diverticulum duo- de
Size: 2111px × 1184px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
