Obturator internus muscle

The obturator internus muscle, like the piriformis muscle, is both a muscle of the pelvic wall and of the gluteal region. It originates within the pelvis, and continues as a flattened tendon posteriorly through the lesser sciatic foramen (between ischial spine and tuberosity).


  • origin
    • anterolateral wall of true pelvis
    • deep surface of obturator membrane and surrounding bone
  • insertion: medial side of greater trochanter of femur
  • action
    • laterally rotates the extended femur at hip joint
    • abducts flexed femur at hip joint
  • arterial supplyinferior gluteal artery
  • innervationnerve to the obturator internus

Anatomy: Lower limb
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Article information

rID: 44263
Section: Anatomy
Synonyms or Alternate Spellings:
  • Obturator internus

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