Small intestine

Small intestine

Parts of the small intestine.

The small intestine is a winding, tightly folded tube about 6 m (20 ft) long in adults. It connects to the stomach on the top end and to the large intestine (colon) on the bottom end. Most of the food a person consumes is digested and absorbed in the small intestine. The lining of the small intestine has tiny, finger-shaped tissues (villi). These raised tissues greatly increase the surface area of the intestine, which absorbs calories and nutrients from food.

The small intestine consists of three parts. The first part, called the duodenum, connects to the stomach. The middle part is the jejunum. The third part, called the ileum, attaches to the colon.

Current as of: March 22, 2023

Author: Healthwise Staff
Medical Review:
E. Gregory Thompson MD - Internal Medicine
Brian D. O'Brien MD - Internal Medicine
Adam Husney MD - Family Medicine
Peter J. Kahrilas MD - Gastroenterology