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


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


  • Lesser trochanter of the femur.


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


  • Femoral nerve and branches of the lumbar plexus.

Daily uses

  • Climbing a step.

Example stretches

Example strengthening exercises

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