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Inferior pubic ramus Ramus inferior ossis pubis

The inferior pubic ramus is a part of the pubis, or pubic bone, one of the three bones that make up the hip bone. It descends inferolaterally from the body of the pubic bone to join the ramus of the ischium below the obturator foramen. As it descends towards the ramus of the ischium it becomes narrower. It has two surfaces: an anterolateral surface and a posteromedial surface. The anterolateral surface faces the thigh and is rough for the attachment of four muscles: gracilis, obturator externus, adductor magnus and adductor brevis. On the other hand, the posteromedial surface is smooth and faces the perineum. The obturator internus attaches to this surface.

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