Qta

Small intestine

Figure 13.25 A. Primary intestinal loop before rotation (lateral view). The superior mesenteric artery forms the axis of the loop. Arrow, counterclockwise rotation. B. Similar view as in A, showing the primary intestinal loop after 180° counterclockwise rotation. The transverse colon passes in front of the duodenum.

Development of the midgut is characterized by rapid elongation of the gut and its mesentery, resulting in formation of the primary intestinal loop (Figs. 13.24 and 13.25). At its apex, the loop remains in open connection with the yolk sac by way of the narrow vitelline duct (Fig. 13.24). The cephalic limb of the loop develops into the distal part of the duodenum, the jejunum, and

Diaphragm

Liver Esophagus

Vitelline duct

Allantois

Diaphragm

Liver Esophagus

Gallbladder

Falciform ligament

Cecum

Vitelline Duct

Lesser omentum

Stomach

Duodenum

Descending colon

Allantois

Jejunoileal loops

Rectum

Falciform ligament

Gallbladder

Cecum

Lesser omentum

Stomach

A Cloacal membrane

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