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Glossary of Physiology Terms -
Duodenum

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Duodenum

Definition:
The first region (i.e., most proximal region) of the small intestine. Chyme leaving the stomach (through the pyloric valve) first enters the duodenum. The contents of the duodenum empty into the jejunum (middle region of the small intestine). In adult humans, the duodenum is about 25-38 cm (10-15 inches) long.

Related glossary terms/phrases:
Jejunum
Ileum




Posted: Saturday, January 10, 2015
Last updated: Wednesday, March 12, 2025
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