. On retro-peritoneal hernia : being the 'Arris and Gale' lectures on the 'The anatomy and surgery of the peritoneal fossae' : delivered at the Royal College of Surgeons of England in 1897. cial artery by which it is supplied (Fig. 2, a, b, c). The first segment consists of the stomach and duodenum,attached by the mesentery containing the cceliac axis. Thisprimitive mesentery is known as the mesogaster, or, moreproperly, as the mesogastrioduodenum. The stomach isplaced, with its lesser curvature, in front and to the right, 1 2 THE INTESTINAL CANAL AND PERITONEUM its greater curvature to the le
. On retro-peritoneal hernia : being the 'Arris and Gale' lectures on the 'The anatomy and surgery of the peritoneal fossae' : delivered at the Royal College of Surgeons of England in 1897. cial artery by which it is supplied (Fig. 2, a, b, c). The first segment consists of the stomach and duodenum,attached by the mesentery containing the cceliac axis. Thisprimitive mesentery is known as the mesogaster, or, moreproperly, as the mesogastrioduodenum. The stomach isplaced, with its lesser curvature, in front and to the right, 1 2 THE INTESTINAL CANAL AND PERITONEUM its greater curvature to the left and behind ; the fundus isabove, and the pylorus below, nearly in the middle line. Thesurfaces look laterally, the left being slightly inclined to thefront. At the junction of the pylorus with the duodenum isa curve, the convexity of which is to the front and right. Inthe mesentery of the concavity of this curve lies the head ofthe pancreas, the body and tail of which extend to the left,upwards, and backwards in the mesogaster. Above the tailof the pancreas, also in the mesogaster, the spleen lies. Thedistal end of the duodenum, where later the flexura duodeno- livcr Ventral fold. Sjble, en. ■ fian erects Fig. i.—Anteroposterior Section of the Trunk of an Early Embryo. (Hertwig.) jejunalis is found, lies in the median plane of the body, andpossesses no mesentery. It is here at a very early periodfixed to the posterior abdominal wall, and at this point theduodenum forms, with the first portion of the jejunum, acurve whose concavity is forward. The second segment of the intestinal canal extends fromthe flexura duodeno-jejunalis in a long loop (the umbilicalloop of Toldt) to the umbilicus, and back to the posteriorabdominal wall. This loop consists of a proximal portion,a curvature and a distal portion. The two limbs of the looprun almost parallel with one another, and are united by a longnarrow mesentery containing the superior mesenteric an early stage, the prox
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