The interactive dog atlas · Organs · Abdomen

Duodenum duodenum

The duodenum is the first part of the small intestine. It leaves the stomach, descends on the right side of the abdomen, next to the right kidney, and turns back up toward the rest of the intestine.

Educational material, not a diagnostic tool. Written by the Mantrailing România team from veterinary sources we read. Updated 14.11.2026.

Dog in left lateral view — exterior, muscles, skeleton and organs Vector study after the Ellenberger, Baum and Dittrich plates: a standing dog, head to the left, deep chest and digitigrade limbs. The four layers use the same contour: exterior with body regions, superficial muscles, skeleton and organs.
Duodenum on the atlas drawing, "Organs" layer. Left lateral view, after the Ellenberger, Baum and Dittrich plates.

Where it is

The first part of the small intestine, on the right side (dashed outline).

Layer
Organs
System
Digestive system
Region
Abdomen

What it is and what it does

The duodenum leaves the pylorus, makes the cranial flexure, descends on the right side of the abdomen as the descending duodenum, next to the right kidney and lateral to the ascending colon, turns back through the caudal flexure and climbs toward the duodenojejunal flexure. It receives bile and pancreatic juice through the major duodenal papilla. Being on the right, in the view from the left it is drawn with a dashed outline.

Worth remembering

Bile and pancreatic juice arrive here. Being on the right, in the view from the left it is drawn with a dashed outline.

Names

Guides it appears in