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The duodenum is the first part of the small intestine. It is located between the stomach and the middle part of the small intestine, or jejunum. After foods mix with stomach acid, they move into the duodenum, where they mix with bile from the gallbladder and digestive juices from the pancreas.
Jejunum and Ileum. The jejunum and ileum are the distal two parts of the small intestine. In contrast to the duodenum, they are intraperitoneal (lie within the peritoneal cavity). They are attached to the posterior abdominal wall by mesentary (a double layer of peritoneum).The jejunum begins at the duodenojejunal flexure.he jejunum and ileum are the distal two parts of the small intestine. In contrast to the duodenum, they are intraperitoneal (lie within the peritoneal cavity). They are attached to the posterior abdominal wall by mesentary (a double layer of peritoneum). The jejunum begins at the duodenojejunal flexure.