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The Anatomy of the Human Peritoneum and Abdominal Cavity

George S. Huntington

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Book Excerpt: 
. . .His.)   Fig. 103.—Alimentary canal and appendages of human embryo of 12.5 mm. × 12. (Kollmann, after His.) Fig. 104.—A. Schematic representation of alimentary canal, with umbilical loop and mesenteric attachments in human embryo of about six weeks. B and C, stages in the intestinal rotation.

The future portions of the human adult alimentary tract below the stomach may be referred, in reference to their derivation, to this primitive condition of the tube as follows:

1. The segment of small intestine situated between the pylorus and the beginning or point of departure of the proximal or descending limb of the umbilical loop, develops into the duodenum. This portion of the small intestine is indicated early in embryos of 2.15 mm. (Fig. 101), by the origin of the hepatic duct from the intestinal tube. Somewhat later, in embryos of 4.10-5 mm. length, (Fig. 102) it becomes additionally marked by the o. . . Read More