Human anatomy, including structure and development and practical considerations . d, passing from the duotleno-jejunal to the posterior wall on theleft. The pocket is less deep than the j^receding. It is usually vascular, the in-ferior mesenteric vein running in the fold, sometimes near its edge. These twofossre frequently coexist, and the left ends of the folds may be continuous, so as toform a large C-shaped fold, open to the right, with a pocket under both the upperand the lower limbs. In this case the vein may be in the vertical part of the arterial arch, formed either by
Human anatomy, including structure and development and practical considerations . d, passing from the duotleno-jejunal to the posterior wall on theleft. The pocket is less deep than the j^receding. It is usually vascular, the in-ferior mesenteric vein running in the fold, sometimes near its edge. These twofossre frequently coexist, and the left ends of the folds may be continuous, so as toform a large C-shaped fold, open to the right, with a pocket under both the upperand the lower limbs. In this case the vein may be in the vertical part of the arterial arch, formed either by the ascending branch of the left colic artery orby the left branch of the middle colic, is often very close to the vein. Such apouch may extend deeply under the fourth part of the duodenum. The niesocolic fossa,^ found in 20 per cent., and always alone, is a little pocketon the top of the duodeno-jejunal flexure under a fold from the posterior layer of thetransverse mesocolon. When th s membrane is reflected so as to show it, the fossa appears to run upward. The in- FiG. ferior mesenteric vein may be inthe fold. The paraduodenal fossa is inthe peritoneum of the posteriorabdominal wall, less intimatelyconnected with the gut than theothers. It is a pocket formed bythe superior branch of the left colicartery raising a fold of the perito-neum. The mouth of the pouchis to the right. It is not uncom-mon in the infant, rare in the retroduodenalfossa is anuncommon pouch under the thirdand fourtii parts of the duodenum,extending uj)ward with the mouthbelow. Interiorof the Duodenum.—The mucous coat is smooth inthe first part and overlies theglands of Brunner (page 1639),which lie chiefly within the submucosa and form a continuous layer for some 4 or5 cm. ; beyond they are scattered for some distance farther. The villi are small atthe beginning, but soon attain their complete size. The valvulae conniventes are atfirst absent for about cm., appearing at the end of th
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
