sciatic foramen

noun

: either of two foramina on each side of the pelvis that are formed by the hip bone, 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