. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 942 PERITONEUM. selves, by using great care in manipulation, that it is not the result of violence; it exists also in the mesenteries of some animals. The arteries that ramify in the great omen- turn are branches of the gastro-epiploica dextra and sinistra, and some anastomosing ones from the colica media which pass round the colon and enter the omentum on the side of the in- testine opposite to that on which the artery reaches it. Veins and doubtless nerves accom- pany these arteries, and there are some lym- phatic glan
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 942 PERITONEUM. selves, by using great care in manipulation, that it is not the result of violence; it exists also in the mesenteries of some animals. The arteries that ramify in the great omen- turn are branches of the gastro-epiploica dextra and sinistra, and some anastomosing ones from the colica media which pass round the colon and enter the omentum on the side of the in- testine opposite to that on which the artery reaches it. Veins and doubtless nerves accom- pany these arteries, and there are some lym- phatic glands enclosed between the layers of the great omentum along the greater curvature of the stomach. The use of the great omentum has never been satisfactorily pointed out. It is peculiar to, and universal in, the class Mammalia, and therefore always co-exists with a diaphragm; probably it has some reference to the incessant motion and constantly recurring compression to which the intestines are subject from the action of that muscle in respiration. It is frequently seen dipping very deeply between the convo- lutions of the intestines, and occupying their interspaces as a moveable packing material, as if thereby enabling them to retain their cylindrical form whilst subject to incessant disturbance. The great omentum, being continuous as one sheet with the splenic omentum, may be re- garded as a great pouch or widening of the mesentery of the stomach. In those animals, such as the Carnivora, which have a very short colon, the great omentum does not extend from the stomach to the colon, but from the stomach to the pancreas, or to a transverse line of attach- ment corresponding in position with that of the transverse part of the duodenum in the human subject. The large intestine in these animals crosses over the small intestine at a point very near the termination of the latter in the crecum, that is to say, over the lower part of the ileum, where it usually has a proper mesentery.* T
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