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Obturator externus

Other Terms: External obturator, Musculus obturatorius externus, Muscle obturateur externe

Muscle parts

None

Latin name

Musculus obturatorius externus

Latin muscle parts

None

Group

Hip joint muscle – deep hip rotator group or Pelvis/perineal wall – lateral musculature – external layer

Etymology

The English name of this muscle is the outer muscle that occludes, or stops up. This reference to occluding comes from the fact that it covers the large foramen of the same name in the os coxae. The word obturator comes from the Latin verb obturare meaning “to occlude or stop up.” The Latin term externus means “outward.”

Origin

Medial two-thirds of the external surface of the obturator membrane and the adjacent surfaces of the pubic body and pubic and ischial rami.

Insertion

Trochanteric fossa on the medial aspect of the greater trochanter of the femur.

Action

Lateral rotation of the hip joint; helps abduct a flexed thigh.

Nerve supply

Obturator nerve (L3 and L4)

Blood supply

The obturator artery and branches of the inferior gluteal artery supply blood from the internal iliac artery, while the ascending branch of the medial circumflex femoral artery and the lateral circumflex femoral artery supply blood from the femoral artery.

Latin

Musculus obturatorius externus

French

Muscle obturateur externe

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