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The jejunum makes up about two-fifths of the small intestine. The main function of the jejunum is absorption of important nutrients such as sugars, fatty acids, and amino acids.
The jejunum is the middle of the three parts of the small intestine between the duodenum and ileum. Its arterial supply is provided by the jejunal arteries, while the innervation by the celiac and superior mesenteric plexi together with the vagus nerve.
The jejunum is the second part of the small intestine in humans and most other higher vertebrates, including mammals, reptiles, and birds. Its lining is specialized for the absorption by enterocytes of small nutrient molecules which have been previously digested by enzymes in the duodenum .
The jejunum and ileum are the distal two parts of the small intestine. In contrast to the duodenum, they are intraperitoneal. They are attached to the posterior abdominal wall by mesentery (a double layer of peritoneum). The jejunum begins at the duodenojejunal flexure.
Learn about the jejunum's structure, function, and its role in digestion. Understand its arterial supply, venous drainage, innervation, and lymphatic drainage. Skip to main content
The jejunum’s main function is to absorb micro and macro nutrients contained within the ingested foods and to move the foods and liquids further through the digestive tube in order to complete the digestion process. The anatomy of the jejunum is best explained with its main function in focus.
The jejunum is made of four distinct tissue layers that work together to give the organ its function. The innermost layer, the mucosa, surrounds the hollow lumen and provides contact between the jejunum and chyme. It is made of folds of epithelial tissue specialized for absorption of nutrients.
The jejunum is the small intestine's middle segment, roughly 2.5 meters long. This portion begins at the duodenojejunal junction, where the gastrointestinal tract continues intraperitoneally. The jejunum contains plicae circulares (muscular flaps or valves of Kerckring) and villi.
The jejunum, along with the other areas of the small intestine, is responsible for absorbing nutrients from digested food into the bloodstream. The jejunum is able to absorb these nutrients because it is lined with finger-like projections that are called villi.
The jejunum is the second part of the small intestine. It begins at the duodenojejunal flexure and is found in the upper left quadrant of the abdomen . The jejunum is entirely intraperitoneal as the mesentery proper attaches it to the posterior abdominal wall.