obturator internus
/ˌɒbtjʊreɪtə(r) ɪnˈtəːnəs/ /ˈɒbtʃʊreɪtə(r) ɪnˈtəːnəs/Anatomy
noun
A flat, fan-shaped muscle that covers the internal surface of the obturator foramen, and serves to rotate the thigh laterally.
Origin
Early 17th century; earliest use found in Helkiah Crooke (1576–1648), physician and anatomist. From post-classical Latin obturator internus from obturator + internus inner.