Medical Definition of Obturator internus
1.
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: musculus obturator internus, internal obturator muscle.
(05 Mar 2000)
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