. Cunningham's Text-book of anatomy. Anatomy. 1186 THE DIGESTIVE Fig. 935.—The Papilla Duodeni in the Interior of the Duodenum. infant, is placed some distance to the left of the ascending part of the duodenum. It is produced by the inferior mesenteric vein raising up a fold of peritoneum, as it runs medially along the side of the fossa, and then above it (see Fig. 934, where the vein, but not the fossa, is shown). It is limited below by a special fold (the mesenterico-meso- colic fold). According to Moynihan, this is the only fossa to the left of the duodenum capable of developing in
. Cunningham's Text-book of anatomy. Anatomy. 1186 THE DIGESTIVE Fig. 935.—The Papilla Duodeni in the Interior of the Duodenum. infant, is placed some distance to the left of the ascending part of the duodenum. It is produced by the inferior mesenteric vein raising up a fold of peritoneum, as it runs medially along the side of the fossa, and then above it (see Fig. 934, where the vein, but not the fossa, is shown). It is limited below by a special fold (the mesenterico-meso- colic fold). According to Moynihan, this is the only fossa to the left of the duodenum capable of developing into the sac of a hernia; and when this occurs, the inferior mesenteric vein always lies in the anterior margin of the orifice of the sac (accompanied for some distance by the ascending branch of the left colic artery). Hood-like plica circularis Duodenal papilla > Common open- ing of bile and ~: pancreatic duct —Plica longifiidi- nalis duodeni Peritoneal Eelations of the Duodenum.—Whilst the relations of the peritoneum to the second and third portions of the duodenum are usually described as in the foregoing account, it should perhaps be pointed out, that it is not really the front, but the right half of the circumference of the descending portion which has a serous coat. Similarly, it is the inferior and anterior half of the circumference of the horizontal portion of the inferior part which is clothed by peritoneum, whilst considerably more than half of the circumference of its ascending portion is covered ; for the peritoneum forms a fold running in behind this portion, in addition to covering its left side and half its anterior aspect. Interior of Duodenum.—No plicae circulares are found in the duodenum for an inch or two beyond the pylorus. They then begin; at first as low, scattered, and irregular folds; further down, they gradually become larger, more regular and more numerous; and by the time the middle of the descending part is reached they have attained a con
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