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.
| Ischial spine | |
|---|---|
 Capsule of hip-joint (distended). Posterior aspect. (Spine of ischium labeled at upper left.) | |
 Left hip-joint, opened by removing the floor of the acetabulum from within the pelvis. (Spine of ischium labeled at center left.) | |
| Details | |
| Identifiers | |
| Latin | spina ischiadica spina ischiaca spina ischialis |
| TA98 | A02.5.01.205 |
| TA2 | 1343 |
| FMA | 17028 |
| Anatomical terms of bone | |
Structure
| Part | Attachment |
|---|---|
| external surface | gemellus superior muscle[1] |
| internal surface | coccygeus muscle,[2] levator ani muscle, pelvic fascia |
| pointed extremity | sacrospinous ligament |
The pudendal nerve travels close to the ischial spine.[3]
Clinical significance
The ischial spine can serve as a landmark in pudendal anesthesia, as the pudendal nerve lies close to the ischial spine.[3][4]
Additional images
Right hip bone, external surface, showing the greater and lesser sciatic notches, separated by the ischial spine
Articulations of pelvis. Anterior view.
Pelvis. Anterior view.
References
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