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Dictionary Meaning and Definition on 'Duodenum'

Duodenum Meaning and Definition from WordNet (r) 2.0
    duodenum n : the part of the small intestine between the stomach and the jejunum [also: duonas (pl), duona (pl)]
Duodenum Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Duodenum \Du`o*de"num\, n. [NL., fr. duodeni twelve each: cf. F. duodenum. So called because its length is about twelve fingers' breadth.] (Anat.) The part of the small intestines between the stomach and the jejunum. See Illust. of Digestive apparatus, under Digestive.
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Wikipedia Meaning and Definition on 'Duodenum'

The duodenum is the first 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 anterior intestine or proximal intestine may be used instead of duodenum.

The duodenum precedes the jejunum and ileum and is the shortest part of the small intestine, where most chemical digestion takes place. The name duodenum is from the Latin duodenum digitorum, or twelve fingers' breadths.

In humans, the duodenum is a hollow jointed tube about 10–12 inch long connecting the stomach to the jejunum. It begins with the duodenal bulb and ends at the ligament of Treitz.

The duodenum is largely responsible for the breakdown of food in the small intestine, using enzymes. Brunner's glands, which secrete mucus, are found in the duodenum. The duodenum wall is composed of a very thin layer of cells that form the muscularis mucosae. The duodenum is almost entirely retroperitoneal.

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