Small intestine

Small Intestine. A long muscular tube that connects the bottom of the stomach with the large intestine (large bowel).

Source: RDCRN (NCATS/NIH)1

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Your small intestine is the longest part of your digestive system - about twenty feet long! It connects your stomach to your large intestine (or colon) and folds many times to fit inside your abdomen. Your small intestine does most of the digesting of the foods you eat. It has three areas called the duodenum, the ileum, and the jejunum.

Source: MedLinePlus (NIH)2

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Intestine, Small: The portion of the Gastrointestinal Tract between the Pylorus of the Stomach and the Ileocecal Valve of the Large Intestine. It is divisible into three portions: the Duodenum, the Jejunum, and the Ileum.3

Anatomical Information about Small intestine

The small intestine (also called small bowel) is part of the body’s digestive system. It is a long, coiled tube that connects the stomach to the large intestine. The small intestine receives food from the stomach, helps break it down, and absorbs nutrients that are used by the body. The three parts of the small intestine are the duodenum, jejunum, and ileum. The duodenum connects to the stomach, and the ileum connects to the colon.

Source: NCI (NIH)4

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The small intestine is part of the body’s digestive system, which also includes the esophagus, stomach, and large intestine. The digestive system removes and processes nutrients (vitamins, minerals, carbohydrates, fats, proteins, and water) from foods and helps pass waste material out of the body. The small intestine is a long tube that connects the stomach to the large intestine. It folds many times to fit inside the abdomen.

The small intestine connects the stomach and the colon. It includes the duodenum, jejunum, and ileum.

Source: NCI (NIH)5

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The small intestine is the organ where most digestion occurs. The small intestine measures about 20 feet and includes the

  • duodenum, the first part of the small intestine
  • jejunum, the middle section of the small intestine
  • ileum, the lower end of the small intestine

Source: NIDDK (NIH)6

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What is the small intestine?

The small intestine is the tube-shaped organ between the stomach and large intestine. Most food digestion and nutrient absorption take place in the small intestine. The small intestine is about 20 feet long and includes the duodenum, jejunum, and ileum:

duodenum—the first part of the small intestine, where iron and other minerals are absorbed

jejunum—the middle section of the small intestine, where carbohydrates, proteins, fat, and most vitamins are absorbed

ileum—the lower end of the small intestine, where bile acids and vitamin B12 are absorbed

Source: NIDDK (NIH)7

Anatomy Articles

Read about these related anatomy topics:



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References

  1. Source: RDCRN (NCATS/NIH): rarediseasesnetwork.org/ cms/ cegir/ Learn-More/ Glossary
  2. Source: MedLinePlus (NIH): medlineplus.gov/ smallintestinedisorders.html
  3. Source: MeSH (U.S. National Library of Medicine)
  4. Source: NCI (NIH): cancer.gov/ types/ small-intestine
  5. Source: NCI (NIH): cancer.gov/ types/ small-intestine/ patient/ small-intestine-treatment-pdq
  6. Source: NIDDK (NIH): niddk.nih.gov/ health-information/ digestive-diseases/ intestinal-pseudo-obstruction
  7. Source: NIDDK (NIH): niddk.nih.gov/ health-information/ digestive-diseases/ short-bowel-syndrome

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.