Jejunum
Part of the small intestine / From Wikipedia, the free encyclopedia
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The jejunum is the second part of the small intestine in humans and most higher vertebrates, including mammals, reptiles, and birds. Its lining is specialized for the absorption by enterocytes of small nutrient molecules which have been previously digested by enzymes in the duodenum.
Jejunum | |
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Details | |
Pronunciation | /dʒɪˈdʒuːnəm/[1][2] |
Precursor | midgut |
Part of | Small intestine |
System | Digestive system |
Artery | jejunal arteries |
Vein | jejunal veins |
Nerve | celiac ganglia, vagus[3] |
Identifiers | |
Latin | jejunum |
MeSH | D007583 |
TA98 | A05.6.03.001 |
TA2 | 2958 |
FMA | 7207 |
Anatomical terminology |
The jejunum lies between the duodenum and the ileum and is considered to start at the suspensory muscle of the duodenum, a location called the duodenojejunal flexure.[4] The division between the jejunum and ileum is not anatomically distinct.[5] In adult humans, the small intestine is usually 6–7 m (20–23 ft) long (post mortem), about two-fifths of which (about 2.5 m (8.2 ft)) is the jejunum.[4]