Jejunum
Jejunum
The Jejunum (/dʒɪˈdʒuːnəm/; from Latin jejunus, meaning 'empty') is the second part of the small intestine in humans and most higher vertebrates, including mammals, reptiles, and birds. It is typically located between the duodenum and the ileum.
Etymology
The term "jejunum" originates from the Latin word jejunus, which means "empty". This name was chosen because in death, the jejunum often appears empty.
Function
The primary function of the jejunum is the absorption of important nutrients such as sugars, amino acids, and fatty acids. This is facilitated by the presence of villi and microvilli, which increase the surface area for absorption.
Structure
The jejunum is typically about 2.5 meters long in humans. It starts with the duodenojejunal flexure and ends at the ileum. The lining of the jejunum is made up of a mucous membrane, which contains numerous folds and villi to increase the surface area for nutrient absorption.
Related Terms
- Duodenum: The first part of the small intestine, which receives partially digested food from the stomach.
- Ileum: The third and final part of the small intestine, which absorbs vitamin B12 and bile salts and whatever products of digestion were not absorbed by the jejunum.
- Villi: Small, finger-like projections that extend into the lumen of the small intestine and increase its surface area for nutrient absorption.
- Microvilli: Even smaller projections found on the villi, further increasing the surface area for absorption.
External links
- Medical encyclopedia article on Jejunum
- Wikipedia's article - Jejunum
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