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.
References in periodicals archive ?
If, on examination, tenderness that replicates the dyspareunia is elicited when palpating the levator or obturator internus muscle, pelvic-floor muscle trigger-point injection can be offered (although physical therapy is first-line treatment).
Additionally, there was severe edema involving the left hip adductor muscles (quadratus femoris, obturator externus, and obturator internus), high-grade partial thickness tearing of the adductor magnus muscle at its femoral attachment, and highgrade partial thickness tearing of the obturator internus muscle at its iliac attachment.
A 4.0 x 2.4 cm multi-loculated cystic lesion adjacent to the right obturator internus muscle, medically indeterminate."
According to Terry (1942), the combined function of the obturator internus muscle and both gemelli muscles, work as a powerful hip lateral rotator.
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.
Insight into the function of the obturator internus muscle in humans: observations with development and validation of an electromyography recording technique.
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.
Rather than a poke, the midurethral incision is long enough--about 1.5 cm--for me to reach a finger behind the obturator internus muscle after having sharply dissected the suburethral tissue and fascia.
Myofascial pain syndrome affecting the piriformis and the obturator internus muscle. Pain Pract 2005;5:361-3.
Peritoneal hernia develops through this defect by first increasing separation of muscular band of obturator internus muscle and later separating obturator externus muscle.
Upon physical examination, hyperalgesia was found during palpation of the lesser sciatic notch and the obturator internus muscle. Palpation in this area reproduced the 9/10 pain in his penis and perineum and caused fasciculations in the surrounding buttock musculature.