. On retro-peritoneal hernia . , 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 proximal limit of the loop lies more to THE INTESTINAL CANAL
. On retro-peritoneal hernia . , 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 proximal limit of the loop lies more to THE INTESTINAL CANAL AND PERITONEUM II the rij^ht, and this results in the whole umbilical loop withits mesentery lying in a plane which tends to the loop corresponds to the jejunum, ileum, caecum, ascend-ing and transverse colon. The first indication of the ap-pearance of the caecum is a slight bulging on the wall ofthe canal somewhere near the mid-point of the distal sectionof the loop. The portion of the umbilical loop before the. Fig. 2.—a, b, c, Subsequent Developments in the Intestinal Canal, SHOWING the ArTEKIES SUPPLIED TO EACH SEGMENT. (ToLDT.) point where the caecum develops is relatively larger thanthe portion bc}ond. The termination of the lo(jp is at arather acute bend, subsecjuently the splenic Hexure of thecolon. At this i^oint begins the third segment of the intestinaltract, which extends from the splenic flexure downwards,and includes the descending colon, sigmoid (omega) loop, THE INTESTINAL CANAL AND PERITONEUM and rectum. It has a short, narrow mesentery, \\ithin whichHes the inferior mesenteric artery. The subsequent developments of the various sections ofthe canal are of great importance. SUBSEQUENT DEVELOPMENT OF THE ABDOMINALORGANS. The subsequent alterations in the relative positions andconditions of the various organs, including the intestine, largeand small, are due in great measure to the disproportionateincrease in growth of these organs. As this increa
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