n :  either of two foramina on each side of the pelvis that are formed by the hipbone, the sacrospinous ligament, and the sacrotuberous ligament and that form a passage from the pelvis to the gluteal and peroneal regions:  a  :  one giving passage to the piriformis muscle and to the sciatic, superior and inferior gluteal, and pudendal nerves together with their associated arteries and veins - called also greater sciatic foramen   b  :  one giving passage to the tendon of the obturator internus muscle and its nerve, to the internal pudendal artery and veins, and to the pudendal nerve - called also lesser sciatic foramen  .
 
 
 
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