Iliopsoas: Origin, Insertion, Action & Nerve Supply


The iliopsoas muscle is actually two muscles, the psoas major and the iliacus muscle. They originate in different areas, but come together to form a tendon, and commonly referred to as one muscle.

adductor of thigh muscles

Attachments of the iliopsoas

Origin-The psoas major originates from lumbar vertebrae, and the iliacus originates from iliac fossa of the pelvis.

Insertion-They inserts together onto the lesser trochanter of the femur.

Function of the iliopsoas

The iliopsoas muscle flexes the lower limb at the hip joint and assists lateral rotation at the hip joint.


Nerve Supply of the iliopsoas

The psoas major muscle is innervated by anterior rami of L1-3, and the iliacus is innervated by femoral nerve.