Lesser sciatic foramen
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![Pudendal nerve and its course through the lesser sciatic foramen.](/Images/godic/202501/13/Pudendal_nerve.svg3702.png")
The lesser sciatic foramen is an opening (foramen) between the pelvis and the back of the thigh. The foramen is formed by the sacrotuberous ligament which runs between the sacrum and the ischial tuberosity and the sacrospinous ligament which runs between the sacrum and the ischial spine.