Origin
Inner lip of iliac crest & iliolumbar ligament
Insertion
12th rib & transverse processes vertebra L1-L4
Actions
- Assists inspiration by bracing the 12th rib
- Assist stabilization of spine/pelvis
- Bilateral contraction: Assists with trunk extension
- Unilateral contraction: Assists with trunk lateral flexion
Innervation
- 12th thoracic intercostal nerve
- Iliohypogastric nerve
- Ilioinguinal nerve
Blood Supply
- Lumbar arteries
- A lumbar branch of the iliolumbar artery
Would you like to learn more about the quadratus lumborum muscle? Then check out the quadratus lumborum muscle article and video by clicking the link below: Quadratus Lumborum Muscle Anatomy
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