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Obturator internus

Other Terms: Internal obturator, Musculus obturator internus, Musculus obturatorius internus, Muscle obturateur interne

Muscle parts

None

Latin name

Musculus obturatorius internus

Latin muscle parts

None

Group

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

Etymology

The English name of this muscle is the within (middle) 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 internus means “within.”

Origin

Internal surface of the obturator membrane and the surrounding bone from the pelvic brim to the base of the pubo-ischial ramus and the pubic body to the edge of the greater sciatic notch.

Insertion

Anteriorly on the medial surface of greater trochanter of femur above the trochanteric fossa.

Action

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

Nerve supply

Nerve to obturator internus (L5 and S1)

Blood supply

Blood supply is from the internal iliac artery via the obturator artery, the superior and inferior gluteal arteries, and the internal pudendal artery.

Latin

Musculus obturatorius internus

French

Muscle obturateur interne

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