obturator internus muscle

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ob·tu·ra·tor in·ter·nus mus·cle

(ob'tŭr-ā-tŏr in-ter'nŭs mŭs'ĕl)
Origin, pelvic surface of obturator membrane and margin of obturator foramen; insertion, passes out of pelvis through lesser sciatic foramen, in so doing, making a 90° turn to insert into the medial surface of greater trochanter; action, rotates thigh laterally; nerve supply, nerve to obturator internus (sacral plexus).
Synonym(s): musculus obturatorius internus [TA] , internal obturator muscle.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
In addition to the levator muscles, piriformis and obturator internus and externus should be also evaluated carefully.
In pelvic position pain may be felt when the thigh is flexed and medially rotated, because the obturator internus is stretched.
This was accompanied by high-grade partial thickness tearing of adductor magnus and obturator internus muscles.
The sciatic nerve rests on the ischium and then passes posterior to the obturator internus, quadratus femoris, and adductor magnus muscles.
A 4.0 x 2.4 cm multi-loculated cystic lesion adjacent to the right obturator internus muscle, medically indeterminate."
The gemelli muscles, together with piriformis, obturator internus, obturator externus and quadratus femoris, are deep muscles of the hip joint.
Mainly, L2-L3 intervertebral space, sternoclavicular joints, knees, left hip, elbows, left shoulder, left deltoid muscle, right subscapularis muscle, left obturator internus muscle, and gluteal muscles were involved.
MRI confirmed the lesion and its extension to the left coxofemoral joint and to the obturator internus muscle (Figure 2), its heterogeneous nature, comprising both liquidous and tissular phases, and revealed a hypersignal inside the bone where the lesion laid.
We present a previously unreported case of acute obturator internus and Obturator externus strain in an adolescent.
It passes through the following structures in the following order: gracilis, adductor brevis muscle, obturator externus muscle, obturator membrane, and beneath or through the obturator internus muscle and periurethral endopelvic connective tissue; it finally exits through the opened vagina.
I perform a similar hydrodissection under the urethra as I do in a retropubic procedure, though instead of injecting 5 cc's to the underside of the pubic symphysis on each side, I instead inject toward the obturator internus muscles.