The ischial spine is part of the posterior border of the body of the ischium bone of the pelvis. It is a thin and pointed triangular eminence, more or less elongated in different subjects.
Structure
The pudendal nerve travels close to the ischial spine.
Clinical significance
The ischial spine can serve as a landmark in pudendal anesthesia, as the pudendal nerve lies close to the ischial spine.
Additional images
References
This article incorporates text in the public domain from page 235 of the 20th edition of Gray's Anatomy (1918)
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