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:
February 10, 2021
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
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
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