The lesser sciatic foramen is a small osteoligamentous foramen which provides communication of neurovascular structures between the pelvis, the perineum, and the gluteal region. The lesser sciatic foramen is separated from the larger greater sciatic foramen above by the sacrospinous ligament.
It is bounded by:
- lesser sciatic notch (anteriorly), ischial spine (anterosuperiorly) and ischial tuberosity (anteroinferiorly)
- sacrospinous ligament (superiorly)
- sacrotuberous ligament (posteriorly)