Question #467

The lesser sciatic foramen is formed by two ligaments:

The sacrotuberous ligament running from the sacrum to the ischial tuberosity forms the inferior border.

The sacrospinous ligament running from the sacrum to the ischial spine forms the superior border.

The lateral border is formed by the ischium and the lesser sciatic notch.

Structures that pass through include:

• The tendon of obturator internus and its nerve
• Pudendal nerve
• Internal pudendal vessels

N.B. The pudendal nerve and internal pudendal vessels pass from the pelvis through the greater sciatic foramen, wrap around the ischial spine and then pass to the perineum through the lesser sciatic foramen. They do not re-enter the pelvis.

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