. Journal of radiology . ivepositions of the large and small intes-tines during the process. In the fifth week of embryonic lifethe foregut is firmly fixed by both dorsaland ventral mesenteries. The mid andhind guts are slung up to the posteriorbody wall by their dorsal mesenteriesonly. The ventral mesenteries have dis-appeared. The mesentery of the mid-gut is long and the intestinal tube formsa long U loop from the convex end ofwhich the vitelline duct passes throughthe umbilical opening to the yolk the limbs of the U loop thefore and hind guts, there are acutebends, and the gut has
. Journal of radiology . ivepositions of the large and small intes-tines during the process. In the fifth week of embryonic lifethe foregut is firmly fixed by both dorsaland ventral mesenteries. The mid andhind guts are slung up to the posteriorbody wall by their dorsal mesenteriesonly. The ventral mesenteries have dis-appeared. The mesentery of the mid-gut is long and the intestinal tube formsa long U loop from the convex end ofwhich the vitelline duct passes throughthe umbilical opening to the yolk the limbs of the U loop thefore and hind guts, there are acutebends, and the gut has little mobilityabove and below these points. The Uloop which is supplied by the superiormesentric artery, is not able to movevery freely in a lateral direction, be-cause its apex is fixed by the attach-ment of the vitelline duct to the umbili-cus. It is, however, able to rotatearound its base where the two limbs ofthe U are close together. After thefifth week the midgut increases inlength very rapidly, far out-stripping. Fig. 7.—Arrested rotation of intes-tine: (1.) liver, () ascendingcolon, (a.) appendix adherent to lat-eral aspect of ascending colon andto iliac parietal peritoneum, ()great omentum), (i.) terminal ileum.(From Huntington.) 2 365 POSITIONAL ANOMALIES OF THE INTESTINAL TRACT—HUBENY
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