Is duodenum C shaped or U shaped?

The duodenum is the first section of the small intestine in most higher vertebrates … The duodenum is a 25–30 cm (10-12 inch) C- shaped structure lying adjacent to the stomach. The first part of the duodenum lies within the peritoneum but its other parts are retroperitoneal. The duodenum can be divided into four parts; superior, descending, inferior and ascending. The duodenum plays an important role in regulating the emptying of stomach contents into the small intestine.

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