azygos vein in dogs

An unpaired vein which in humans arises from the right ascending lumbar vein or the vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates in the superior vena cava; unlike humans, mice have a single and left-sided azygos vein that develops from the paired embryonic cardinal venous system and drains most of the right and left thoracic walls into the left anterior vena cava[MP]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the azygos vein is

An unpaired vein which in humans arises from the right ascending lumbar vein or the vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates in the superior vena cava; unlike humans, mice have a single and left-sided azygos vein that develops from the paired embryonic cardinal venous system and drains most of the right and left thoracic walls into the left anterior vena cava[MP]. The atlas records it as a vein at the organ scale in the dog.

Where the azygos vein is

It sits within the cardiovascular system. Only the system is known. The position shown carries almost no spatial information.

What the azygos vein connects to

The atlas records 3 typed relationships for it, across 2 kinds of connection. a kind of vein.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the azygos vein. 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 azygos venous tree and vena azygos. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001594, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• A kind of: vein.
• Connected to: anterior vena cava and superior intercostal vein.

Questions

Where is the azygos vein?

It sits within the cardiovascular system. Only the system is known. The position shown carries almost no spatial information.

What does the azygos vein connect to?

A kind of: vein.

Is the azygos vein 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.