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49 Obturator internus Partly within the cavity of her pelvis, arising from the inner surface of the anterior and external wall, it is attached to the descending ramus of the os pubis and the ramus of the ischium Behind the pelvic brim, thrusting from the upper, arising also from the inner surface at the posterior, completing the arch, the canal for passage, where fibers converge rapidly, backward, downward. ...

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