Iliopsoas Muscle

Iliopsoas is sometimes classified as two muscles, Iliacus and Psoas major, with Iliacus arising from the Ilium and Psoas from the vertebrae.

Origin - Inner surface of the Ilium.
Base of the sacrum.
Sides of the bodies of T12-L5.

Insertion - Lesser trochanter of the femur.

Actions - Flexion of the hip.
Lateral rotation of the hip.
Flexes torso when the legs are fixed (e.g. laying to sitting).

Innervation - Femoral nerve and branches of the lumbar plexus.

Daily uses - Climbing a step.

Example stretches - Hip flexor stretch.

Example strengthening exercises - Isometric hip flexion.
Standing hip flexion with a resistance band.