Origin
Transverse processes L1-L5 + vertebral bodies T12-L5 & adjacent intervertebral discs
Insertion
Lesser trochanter of the femur
Actions
- Flexion of the hip joint (primary)
- Weak assistance in lateral flexion of the trunk
- Weak assistance in external rotation of the femur
- Provides dynamic stability to the femur and the hip
Innervation
- Anterior rami of the first, second and third lumbar nerves (L1-L3)
Blood Supply
- Lumbar branch of iliolumbar artery (primary source)
- Obturator artery
- External iliac artery
- Femoral artery
Would you like to learn more about the psoas major muscle? Then check out the psoas major muscle article and video by clicking the link below: Psoas Major Muscle Anatomy
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