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The duodenum is a short portion of the small intestine connecting it to the stomach. It is about 10 inches (25 cm) long, while the entire small intestine measures about 20 feet (6.5 meters).
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.