Body of ischium

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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 p.235
Anatomical terms of bone

The body of the ischium along with the superior and inferior rami makes up the ischium.

The body 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[edit]

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

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

Muscle attachment[edit]

Two muscles; the deep[1] and superficial transverse perinei muscles, originates from the body of ischium. No muscles do insert on the body.

Additional images[edit]

External links[edit]


  1. ^

This article incorporates text from a public domain edition of Gray's Anatomy.