Coincident with growth in length, the primary intestinal loop rotates around an axis formed by the superior mesenteric artery (Fig. 13.25). When viewed from the front, this rotation is counterclockwise, and it amounts to approximately 270° when it is complete (Figs. 13.24 and 13.25). Even during rotation, elongation of the small intestinal loop continues, and the jejunum and ileum form a number of coiled loops (Fig. 13.26). The large intestine likewise lengthens considerably but does not participate in the coiling phenomenon. Rotation occurs during herniation (about 90°) as well as during return of the intestinal loops into the abdominal cavity (remaining 180°) (Fig. 13.27).
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