Iliopsoas

Written by Roxanne Salkeld

Last updated January 7, 2023 • 8 Revisions •

The iliopsoas is a muscle in the anterior compartment of the thigh. It is comprised of two separate muscles; the psoas major and iliacus. These muscles arise in the pelvis and pass under the inguinal ligament into the anterior compartment of the thigh – where they form a common tendon.

  • Attachments:
    • Psoas major – originates from the lumbar vertebrae
    • Iliacus – originates from the iliac fossa of the pelvis.
    • They insert together onto the lesser trochanter of the femur.
  • Actions: Flexion of the the thigh at the hip joint.
  • Innervation:
    • Psoas major – anterior rami of L1-3
    • Iliacus – femoral nerve.
  • Blood supply: Iliolumbar branch of the internal iliac artery, with contributions from the obturator and femoral arteries.

Fig 1
The muscles of the anterior thigh.

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