Fig. 14-2. The arrangement of the structures emerging from the greater sciatic foramen. The foramen gives exit to the pirformis, to seven nerves (sciatic, posterior femoral cutaneous, superior gluteal, inferior gluteal, pudendal, nerve to the obturator internus, and nerve to the quadratus femoris), and to three groups of vessels (internal pudendal, superior gluteal, and inferior gluteal). The nerve to the quadratus femoris and the veins that accompany the arteries are not shown. Click for high resolution image.