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AnatomyLower limbHip and thigh
Ischial tuberosity
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Ischial tuberosity

Author: Nicola McLaren MSc • Reviewer: Dimitrios Mytilinaios MD, PhD
Last reviewed: November 23, 2022
Reading time: 1 minute

Ischial tuberosity
Tuber ischiadicum
1/11
Synonyms: Tuberositas ischiadica, Tuber ischiale

The ischial tuberosity is a large round protrusion at the inferoposterior aspect of the ischium. It is also known as the “sitting bone”, as this is where the weight of the body is held when seated.

A number of soft tissue structures attach to this tuberosity. For example, the sacrotuberous ligament, some gluteal muscles (inferior gemellus, quadratus femoris), adductor magnus and the posterior thigh muscles (biceps femoris, semitendinosus, semimembranosus) all attach here.

The two ischial tuberosities are used as a landmark (inter-ischial line) to divide the perineum into the anterior urogenital triangle and the posterior anal triangle. This tuberosity is also used to help locate the sciatic nerve, which descends through the pelvis between the ischial tuberosity and the greater trochanter of femur.

Terminology English: Ischial tuberosity
Latin: Tuber ischiadicum
Definition Inferior protuberance of the ischium

Test your knowledge on the hip bone with this quiz.

Learn more about the pelvic bones with this study unit:

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Sources

All content published on Kenhub is reviewed by medical and anatomy experts. The information we provide is grounded on academic literature and peer-reviewed research. Kenhub does not provide medical advice. You can learn more about our content creation and review standards by reading our content quality guidelines.

Moore, K. L., Dalley, A. F., & Agur, A. (2017). Clinically oriented anatomy (8th ed.). Lippincott Williams and Wilkins.

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