Small intestine

Small intestine
Small intestine and surrounding structures
Details
Part ofGastrointestinal tract
SystemDigestive system
ArterySuperior mesenteric artery, jejunal arteries, ileal arteries
VeinHepatic portal vein, superior mesenteric vein
NerveCeliac ganglia, vagus[1]
LymphIntestinal lymph trunk
Identifiers
Latinintestinum tenue
MeSHD007421
TA98A05.6.01.001
TA22933
FMA7200
Anatomical terminology

The small intestine or small bowel is an organ in the gastrointestinal tract where most of the absorption of nutrients from food takes place. It lies between the stomach and large intestine, and receives bile and pancreatic juice through the pancreatic duct to aid in digestion. The small intestine is about 5.5 metres (18 feet) long and folds many times to fit in the abdomen. Although it is longer than the large intestine, it is called the small intestine because it is narrower in diameter.

The small intestine has three distinct regions – the duodenum, jejunum, and ileum. The duodenum, the shortest, is where preparation for absorption through small finger-like protrusions called villi begins.[2] The jejunum is specialized for the absorption through its lining by enterocytes: small nutrient particles which have been previously digested by enzymes in the duodenum. The main function of the ileum is to absorb vitamin B12, bile salts, and whatever products of digestion that were not absorbed by the jejunum.

  1. ^ Nosek, Thomas M. "Section 6/6ch2/s6ch2_30". Essentials of Human Physiology. Archived from the original on 2016-03-24.
  2. ^ human body | Britannica.com

Small intestine

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