jejunum
Sign in to saveThe jejunum is the second part of the small intestine in humans and most 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.
AI overview
The jejunum is the middle section of your small intestine, located after the first part called the duodenum. It has a specialized lining that absorbs nutrients from food that has already been broken down by digestive enzymes, which is essential for getting nourishment from what you eat.
AI-generated from the Wikipedia summary — may contain errors.
Key facts
- Anatomy.Name
- Jejunum
- Anatomy.Latin
- jejunum
- Anatomy.Image
- Illu small intestine.jpg
- Anatomy.Caption
- Small intestine
- Anatomy.Image2
- Gray1041.png
- Anatomy.Caption2
- Superior and inferior duodenal fossæ.
- Anatomy.Precursor
- laude
- Anatomy.Artery
- Jejunal arteries
- Anatomy.Vein
- Jejunal veins
- Anatomy.Nerve
- Celiac ganglia, vagus
- Anatomy.PartOf
- Small intestine
- Anatomy.System
- Digestive system
via Wikipedia infobox
Article
8 sectionsContents
- Structure
- Histology
- Function
- Other animals
- History
- Etymology
- References
- External links
The jejunum is the second part of the small intestine in humans and most 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 lies between the duodenum and the ileum and is considered to start at the suspensory muscle of the duodenum, a location called the duodenojejunal flexure. The division between the jejunum and ileum is not anatomically distinct. In adult humans, the small intestine is usually long (post mortem), about two-fifths of which (about ) is the jejunum.