Tuberosity of the ischium

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Tuberosity of the ischium
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Capsule of hip-joint (distended). Posterior aspect. (Tuberosity of ischium visible at bottom left.)
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The superficial branches of the internal pudendal artery. (Tuber. ischial. visible at center left.)
Latin Tuber ischiadicum, tuberositas ischiadica
Gray's p.235
Anatomical terms of bone

The tuberosity of the ischium (or ischial tuberosity, tuber ischiadicum in Latin, also known as the sitz bone, or as a pair the sitting bones)[1] is a large swelling posteriorly on the superior ramus of the ischium. It marks the lateral boundary of the pelvic outlet.

When sitting, the weight is frequently placed upon the ischial tuberosity.[2] The gluteus maximus covers it in the upright posture, but leaves it free in the seated position.[3]

Divisions[edit]

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:

Additional images[edit]


See also[edit]

Notes[edit]

  1. ^ Sills, Franklyn (2004). Craniosacral Biodynamics: The Primal Midline and the Organization of the Body (revised, illustrated ed.). Berkeley, CA: North Atlantic Books. p. 99. ISBN 1-55643-390-5. 
  2. ^ Goossens (2005), pp 895–982
  3. ^ Platzer (2004), p 236

References[edit]

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

External links[edit]