Iliolumbar artery

The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery.

Iliolumbar artery
The veins of the right half of the male pelvis. (Iliolumbar artery not labeled, but Iliolumbar vein visible at center right.)
Details
Source	Internal iliac artery
Branches	Lumbar branches of iliolumbar artery
Vein	Iliolumbar vein
Supplies	Lumbar vertebrae, ilium
Identifiers
Latin	arteria iliolumbalis
TA98	A12.2.15.002
TA2	4304
FMA	18845
Anatomical terminology [edit on Wikidata]

Structure

The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery.^[1] It turns upward behind the obturator nerve and the external iliac artery and vein, to the medial border of the psoas major muscle, behind which it divides into:

• Lumbar branch of iliolumbar artery

• Iliac branch of iliolumbar artery

Anastomoses

• 1. Last lumbar→iliolumbar
• 2. Lateral sacral↔lateral sacral
• 3. Middle sacral→lateral sacral
• 4. Superior hemorrhoidal→middle hemorrhoidal
• 5. Medial femoral circumflex→inferior gluteal
• 6. Medial femoral circumflex↔obturator
• 7. Lateral femoral circumflex→superior gluteal
• 8. Deep iliac circumflex→superior gluteal
• 9. Deep iliac circumflex→external iliac
• 10. Last lumbar→superior gluteal
• 11. Last lumbar→deep iliac circumflex
• 12. Iliolumbar→deep iliac circumflex.^[2]

Additional images

• 
  Iliolumbar artery