Iliopsoas

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

Example strengthening exercises