Tags: Anatomical Structure, Bone.
The superior ramus of the ischium (descending ramus) projects downward and backward from the body and presents for examination three surfaces: external internal and posterior. The external surface is quadrilateral in shape. It is bounded above by a groove which lodges the tendon of the Obturator externus; below it is continuous with the inferior ramus; in front it is limited by the posterior margin of the obturator foramen; behind a prominent margin separates it from the posterior surface.
