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 ?
3] clearly observed by surgery and reported that stretching of the obturator internus muscle compressed the sciatic nerve.
showed that certain suspected cases of piriformis syndrome maybe due to sciatic nerve crushing by obturator internus muscle, without piriformis involvement [5].
It was carefully dissected away from the urethra, cut in the midline, and then dissected out laterally to its entry into the obturator internus muscle bilaterally.
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.
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.
He was treated twice a week for four weeks with only Active Release Technique (ART)[R] obturator internus muscle protocol.
CT examination of the abdomen and pelvis (with oral and IV contrast) demonstrated a large, complex, multiloculated fluid collection involving the left gluteal musculature, left illiacus muscle, left obturator internus muscle, left iliopsoas muscle, and the left iliopsoas bursae (Figures 2A, C and D) In addition, bone windows demonstrated erosive changes in the left sacroiliac joint (Figure 2B).
The interior fixation arms anchor into the sacrospinous ligament, avoiding the external pulley effect that we have seen with other devices like the Capio, which could put constant tension on key structures, including the obturator internus muscle and the sacrospinous ligament.
Throughout its course except near its origin it was related to the obturator fascia and obturator internus muscle laterally.
The obturator canal is a defect in the tendinous insertion of the obturator internus muscle onto the posterior aspect of the superior pubic ramus, which is a passage way for the obturator neurovascular bundle (Fig.