Rotations of the

The abdominal foregut rotates 90 degrees around its own long axis such that the dorsal side rotates to the left and the ventral side rotates to the right. This results in the spleen being on the left and the lesser omentum being on the right. This rotation creates the omental bursa (lesser sac). The communication between the lesser sac and the greater sac is the epiploic foramen (ofWinslow).

The midgut develops an intestinal loop, which herniates into the umbilical cord. While in the umbilical cord and during retraction from the umbilical cord, the midgut rotates 270 degrees around an anteroposterior axis (marked by the superior mesenteric artery), which is a counterclockwise rotation, as viewed from the ventral side. This rotation results in the jejunum being on the left, and the ileum and cecum being on the right. It also causes the colon to assume the ' shape of an inverted "U".

Development of Liver

Development of Liver

Ventral

Aorta Kidney Mesentery Gl tract

Peritoneum

Peritoneal cavily

Development of Pancreas

Development of Pancreas

Development U X

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of Spleen i I ^

J II II o II

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Secondary fr^ ^A

realization \\ Jj

Secondary fr^ ^A

realization \\ Jj

Rotation /f JL

ll /(, ^

of Foregut 11

j J [y—y

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T 5A

5B

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Figure 111-3-9. Cross-Sectional View of the Abdominal Viscera

ABDOMINAL VISCERA AND PERITONEUM

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