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.

Attachments of the iliopsoas

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