. Cunningham's Text-book of anatomy. Anatomy. 1178 , THE DIGESTIVE SYSTEM. much in size and in the appearance presented by their lining mucous membrane, that they can be distinguished from one another without difficulty. Both the jejunum and ileum are irregularly disposed in the form of crowded loops or coils (Fig. 913) which are connected to the posterior abdominal wall by a great fan-shaped fold of peritoneum, containing their vessels and nerves, and known as the mesentery. Hence the name of intestinum tenue mesenteriale is applied to them. The mesentery is of such a length that the coils ar
. Cunningham's Text-book of anatomy. Anatomy. 1178 , THE DIGESTIVE SYSTEM. much in size and in the appearance presented by their lining mucous membrane, that they can be distinguished from one another without difficulty. Both the jejunum and ileum are irregularly disposed in the form of crowded loops or coils (Fig. 913) which are connected to the posterior abdominal wall by a great fan-shaped fold of peritoneum, containing their vessels and nerves, and known as the mesentery. Hence the name of intestinum tenue mesenteriale is applied to them. The mesentery is of such a length that the coils are able to move about freely in the abdominal cavity, and consequently the position occupied by any portion of the tube, with the exception of the beginning of the jejunum and the ending of the ileum, can never be stated with certainty. Nevertheless, it may be said that, in general, the jejunum occupies the superior and left portions of the cavity below the stomach, the ileum the inferior and right divisions, its terminal part almost always lying in the pelvis, just before it joins the large gut. According to Mall, the most usual arrangement is to find the proximal coils of the jejunum on the left side, and high up. Then the tube crosses the vertebral column below the duodenum, and a few coils are placed on the right side. It then crosses to the left side again, and several coils are formed, some of which may descend into the pelvis. Thence it passes again to the Two mesenteric lymph glands Mesentery Artery - Lymph vessel. Peritoneal coat Circular muscular fibres Longitudinal muscular fibres Fig. 928.—A Portion of Small Intestine, with Mesentery and Vessels. The peritoneal coat has been removed from the right half, and the two layers of the muscular coat exposed. right side, where it is coiled up, and then finally descends into the pelvis. The terminal portion almost always lies in the pelvis, just before it ascends to join the large intestine. As the coats of the large and sm
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