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Ischial spine
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The ischial spine is a sharp bony prominence found on the ramus of the ischium. It sits between the greater and lesser sciatic notches, at the level of the lower border of the acetabulum.
The ischial spine provides an attachment point for the sacrospinous ligament and some fibers of the superior gemellus muscle which originate from the upper margin of the lesser sciatic notch.
In addition, the posterior fibers of the levator ani, specifically the posterolateral fibers of the iliococcygeus muscle, as well as the apex of the coccygeus muscle both arise from the pelvic surface of the ischial spine.
It is worth noting that the internal pudendal vessels and pudendal nerve wind around the dorsal aspect of the ischial spine before entering the perineum.
| Terminology |
English: Ischial spine Latin: Spina ischiadica |
| Definition | Sharp bony projection found on the posterior aspect of the ischium, between the greater and lesser sciatic notches. |
| Function | Attachment point for sacrospinous ligament, iliococcygeus muscle, coccygeus muscle, superior gemellus muscle |
Learn more about the bony landmarks of the hip bone in the following study unit:
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