The body forms the thick posterosuperior arm of the U-shaped ischium. Its external surface contributes to approximately one-half of the acetabulum forming the posterior lunar articular surface for the femur and the greater portion of the acetabular fossa. The internal surface contributes to the wall of the true or lesser pelvis, providing attachment for the obturator internus muscle. Its posterior margin forms the greater and lesser sciatic notches and ischial spine. Its postero-inferior surface is the rough ischial tuberosity.

The term body or its Latin equivalent corpus refers to the large central portion of a structure.

Corpus ossis ischii

Corps de l'ischium

Körper von Ischium