Obturator Externus

Joe Muscolino

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The obturator of the deep lateral group is drawn in bilaterally. The inferior gemellus and quadratus femoris (cut) have been ghosted in on the left side.

The Obturator Externus is a member of the Deep Lateral Rotator Group (also known as the Deep 6), composed of the following six muscles (from superior to inferior):



  • The obturator externus attaches from the external the pelvic bone to the greater trochanter of the femur.
    • The distal attachment is actually onto the trochanteric fossa of the femur.



  • Laterally rotates the thigh at the hip joint.
  • Horizontally abducts the thigh at the hip joint.
  • Adducts the thigh at the hip joint.
  • Contralaterally rotates the pelvis at the hip joint.


NOTE: The obturator externus lies deeper than the other five members of the deep lateral rotator group.