Skip to main content

Unfortunately we don't fully support your browser. If you have the option to, please upgrade to a newer version or use Mozilla Firefox, Microsoft Edge, Google Chrome, or Safari 14 or newer. If you are unable to, and need support, please send us your feedback.

Publish with us
Iliolumbar Vein
Cardiovascular System

Iliolumbar Vein

Vena Iliolumbalis

Read more

Quick Facts

Origin: Union of iliac, spinal, and lumbar branches.

Course: Travel medially from the medial border of psoas major to drain into common iliac veins.

Tributaries: Fourth and fifth lumbar and iliac vein and spinal branches.

Drainage: Iliacus, psoas major, quadratus lumborum, ilium, posterior lumbar and sacral regions.

Complete Anatomy
The world's most advanced 3D anatomy platform
Try it for Free


From its origin, the iliolumbar vein receives anastomotic tributaries from the fourth and fifth lumbar veins.


The iliolumbar vein courses inferiorly along the sacrospinous joint to drain into the internal iliac vein, or more commonly into the common iliac vein. It often bifurcates and drains into both the internal iliac and the common iliac veins (Dorland, 2011).


The iliolumbar vein drains the fourth and fifth lumbar veins.

The spinal branches of the iliolumbar vein drain into the iliolumbar vein and pass through the intervertebral foramen between the fifth lumbar vertebrae and sacrum.

Structures Drained

The iliolumbar vein drains the structures of the iliac fossae and the lumbar and sacral region. This includes the Iliacus, psoas major, and quadratus lumborum muscles.


Dorland, W. (2011) Dorland's Illustrated Medical Dictionary. 32nd edn. Philadelphia, USA: Elsevier Saunders.

Learn more about this topic from other Elsevier products


ScienceDirect image

A venous sinus is a vein with a thin wall of endothelium that is devoid of smooth muscle to regulate its diameter.

Explore on ScienceDirectopens in new tab/window

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy