Psoas Major

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Anterior Hip Muscles.png
Psoas Major
Muscle Type
Origin Transverse processes of L1-5, bodies of T12-L5 and intervertebral discs below bodies of T12-L5
Insertion Middle surface of lesser trochanter of femur
Action Stabiliser and flexor of the hip, lateral flexion of the trunk.
Antagonists Gluteus Maximus
Spinal innervation L1, L2, L3
Peripheral Innervation Anterior primary rami of L1-3 nerves (mainly L2)
Vasculature lumbar arteries, iliolumbar artery, deep circumflex iliac artery, external iliac artery, femoral artery

Lesion Effect

Loss of pelvic swing on walking.