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.