Trunk vessels (aorta, vena cava, abdominal branches)
Iliolumbar arteries
Arteria iliolumbalis (dextra et sinistra)
- Origin
- First branch arising from the posterior trunk of the internal iliac artery
- Insertion
- Ascends recurrently into the iliac fossa, dividing into a lumbar branch (psoas/quadratus lumborum/spinal cord) and an iliac branch (iliacus muscle and ilium)
- Function
- Supplies the iliopsoas, quadratus lumborum, ilium, and lumbar spinal canal
- Innervation
- Lumbosacral sympathetic trunk
- Movement & chain
- Arterial pulsatile flow
- Palpation
- Not palpated directly
- Clinical
- Provides crucial collateral circulation between aortic lumbar arteries and internal iliac; susceptible to iatrogenic injury during sacroiliac joint screw fixation.
- Segmental innervation
- L4-S1 spinal levels
- In clinical practice
- Postoperative monitoring after percutaneous sacroiliac screw placement for occult retroperitoneal bleeding
- Region in the model
- Trunk vessels (aorta, vena cava, abdominal branches)