Obturator externus muscle

Last revised by Henry Knipe on 27 Feb 2023

The obturator externus is a flat, triangular muscle, which covers the outer surface of the anterior wall of the pelvis.


  • origin: external surface of obturator membrane and adjacent bone (inferior pubic ramus and the ramus of the ischium)

  • insertion: trochanteric fossa of femur

  • blood supplyobturator and medial circumflex femoral arteries

  • innervationobturator nerve (L2-L4)

  • action: thigh external rotation, stabilization of hip joint

ADVERTISEMENT: Supporters see fewer/no ads