duodenum in dogs

The first part of the small intestine. At the junction of the stomach and the duodenum the alimentary canal is inflected. The duodenum first goes anteriorly for a short distance, turns dorsally, and eventually caudally, thus it is a U-shaped structure with two horizontal sections (a ventral and a dorsal one). Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the duodenum is

The first part of the small intestine. At the junction of the stomach and the duodenum the alimentary canal is inflected. The duodenum first goes anteriorly for a short distance, turns dorsally, and eventually caudally, thus it is a U-shaped structure with two horizontal sections (a ventral and a dorsal one). The atlas records it as a organ at the organ scale in the dog.

Where the duodenum is

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

What the duodenum connects to

The atlas records 20 typed relationships for it, across 8 kinds of connection. part of digestive tract, organ and small intestine.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the duodenum. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as proximal intestine and upper intestine. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002114, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: digestive tract, organ and small intestine.
• A kind of: anatomical structure.
• Adjacent to: pyloric sphincter.
• contains: crypt of Lieberkuhn of duodenum, duodenal epithelium, duodenal gland, duodenal mucosa, duodenum lamina propria and muscularis mucosae of duodenum, and 2 more.
• flows to: jejunum, stomach, gallbladder and pancreas.
• Continuous with: pylorus.
• contributes to morphology of: small intestine.
• connects: choledocho-duodenal junction.

Questions

Where is the duodenum?

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

What does the duodenum connect to?

Part of: digestive tract, organ and small intestine.

Is the duodenum the same in other species?

This page describes the dog. The human record of the same structure sits beside it on /compare, over one shared model rather than two atlases built separately.