Body of ischium

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Bone: Body of ischium
Right hip bone. External surface. (Ischium is at bottom left.)
Capsule of hip-joint (distended). Posterior aspect.
Latin corpus ossis ischii
Gray's subject #57 235
/ Elsevier

The body of the ischium enters into and constitutes a little more than two-fifths of the acetabulum.


Its external surface forms part of the lunate surface of the acetabulum and a portion of the acetabular fossa.

Its internal surface is part of the wall of the lesser pelvis; it gives origin to some fibers of the Obturator internus.


Its anterior border projects as the posterior obturator tubercle.

From its posterior border there extends backward a thin and pointed triangular eminence, the ischial spine, more or less elongated in different subjects.

Above and below the spine

Above the spine is a large notch, the greater sciatic notch.

Below the spine is a smaller notch, the lesser sciatic notch.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.