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
Dorlands / Elsevier	c_56/12260665

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

Contents 1 Surfaces 2 Borders 3 Above and below the spine 4 Additional images 5 External links

Surfaces

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.

Borders

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

Right hip bone. Internal surface.

Left hip-joint, opened by removing the floor of the acetabulum from within the pelvis.

External links

• SUNY Labs 44:st-0723 - "The Male Pelvis: Hip Bone"

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 As such, some of the information contained herein may be outdated.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.

v • d • e Bones of pelvis/pelvic cavity
General	sacrum, coccyx, hip bone
Ilium	Body (Arcuate line) Wing: gluteal lines (Posterior, Anterior, Inferior) - Fossa - iliac spines (Anterior superior, Anterior inferior, Posterior superior, Posterior inferior) - Crest - Tuberosity
Ischium	Body (Ischial spine, Lesser sciatic notch) - Superior ramus (Tuberosity of the ischium) - Inferior ramus
Pubis	Body - Superior ramus (Pubic tubercle, Pubic crest, Obturator crest) - Inferior ramus (Pectineal line)
Compound	Acetabulum (Acetabular notch) - Iliopubic eminence/Iliopectineal line - Linea terminalis - Ischiopubic ramus/Pubic arch Obturator foramen - Greater sciatic foramen/Greater sciatic notch - Lesser sciatic foramen Lesser pelvis (Pelvic inlet, Pelvic brim, Pelvic outlet) - Greater pelvis