jejunum

The portion of the small intestine that extends from the duodenum to the ileum. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the jejunum is

The portion of the small intestine that extends from the duodenum to the ileum. The atlas records it as a organ at the organ scale in the human body.

Where the jejunum is

It sits within the digestive system. Positioned deliberately as part of this species body plan.

What the jejunum connects to

The atlas records 20 typed relationships for it, across 9 kinds of connection. part of small intestine.

Supply and innervation

Arterial supply: jejunal artery and superior mesenteric artery. Venous drainage: jejunal vein.

Also called

Also recorded as intestinum jejunum, mid-intestine and middle intestine. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002115, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: small intestine.
• A kind of: subdivision of digestive tract.
• contains: crypt of Lieberkuhn of jejunum, intestinal villus of jejunum, jejunal epithelium, jejunal mucosa, lumen of jejunum and mesentery of jejunum, and 4 more.
• flows to: ileum and duodenum.
• Supplied by: jejunal artery and superior mesenteric artery.
• contributes to morphology of: small intestine.
• Develops from: midgut.
• connects: duodeno-jejunal junction.

Questions

Where is the jejunum?

It sits within the digestive system. Positioned deliberately as part of this species body plan.

What does the jejunum connect to?

Part of: small intestine.

Is the jejunum the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.