Structure[ edit ] The duodenum and the jejunum are the first and second parts of the small intestine , respectively. The suspensory muscle of the duodenum marks their formal division. Moreover, separate multiple attachments are not that uncommon. The superior portion is also described as the Hilfsmuskel. When it contracts, by virtue of connections to the third and fourth parts of the duodenum, the suspensory muscle of the duodenum widens the angle of the duodenojejunal flexure, allowing movement of the intestinal contents. It plays an important role in the embryological rotation of the small intestine as the superior retention band.
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