Definitions for jejunumdʒɪˈdʒu nəm
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the part of the small intestine between the duodenum and the ileum
The central of the three divisions of the small intestine which lies between the duodenum and the ileum.
Origin: From ieiunum, neuter of ieiunus.
the middle division of the small intestine, between the duodenum and ileum; -- so called because usually found empty after death
Origin: [NL., fr. L. jejunus empty, dry.]
The jejunum is the middle section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms middle intestine or mid-gut may be used instead of jejunum. The jejunum lies between the duodenum and the ileum. The change from the duodenum to the jejunum is usually defined as the Duodenojejunal flexure and is attached, and thus "hung up", to the ventricle by the ligament of Treitz. In adult humans, the small intestine is usually between 5.5 and 6m long, 2.5m of which is the jejunum. The pH in the jejunum is usually between 7 and 9. If the jejunum is impacted by blunt force the emesis reflex will be initiated. The jejunum and the ileum are suspended by mesentery which gives the bowel great mobility within the abdomen. It also contains circular and longitudinal smooth muscle which helps to move food along by a process known as peristalsis.
U.S. National Library of Medicine
The middle portion of the SMALL INTESTINE, between DUODENUM and ILEUM. It represents about 2/5 of the remaining portion of the small intestine below duodenum.
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