Tuberosity of the ischium

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Bone: Tuberosity of the ischium
Capsule of hip-joint (distended). Posterior aspect. (Tuberosity of ischium visible at bottom left.)
The superficial branches of the internal pudendal artery. (Tuber. ischial. visible at center left.)
Latin tuber ischiadicum
Gray's subject #57 235
/ Elsevier

Posteriorly, the superior ramus of the ischium forms a large swelling, the tuberosity of the ischium (or ischial tuberosity).

It marks the lateral boundary of the pelvic outlet.

When sitting, the weight is frequently placed upon the ischial tuberosity.[1]


The tuberosity is divided into two portions: a lower, rough, somewhat triangular part, and an upper, smooth, quadrilateral portion.

  • The lower portion is subdivided by a prominent longitudinal ridge, passing from base to apex, into two parts;
  • The upper portion is subdivided into two areas by an oblique ridge, which runs downward and outward;
File:Tuberosity of the ischium.PNG
Muscles of the gluteal and posterior femoral regions, with tuberosity of the ischium highlighted in red

See also

Additional images


  1. Goossens R, Teeuw R, Snijders C (2005). "Sensitivity for pressure difference on the ischial tuberosity". Ergonomics. 48 (7): 895–902. PMID 16076744.

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 As such, some of the information contained herein may be outdated.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