Development of the Mesenteries

Two diagrams to illustrate the development of the mesenteries. In the first figure the rotation of the intestinal loop and the continuous primitive mesentery is shown. In the second figure (to the right), which shows a more advances stage, the portions of the primitive mesentery (going to the ascending and descending colons) which disappear through their adhesion to the posterior abdominal wall, are shaded dark, the portions which persist are lightly shaded.

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