Sacrospinous ligamentSacrotuberous ligamentPelvic cavityIlio-inguinal nerveAbdominal cavityGap between inguinal ligament and pelvic bone:• Psoas major, iliacus,    pectineus muscles• Femoral artery• Femoral vein• Lymphatics• Femoral branch of    genitofemoral nerve• Lateral cutaneous    nerve of thigh• Femoral nerveObturator canal:• obturator nerve• obturator vesselsLesser sciatic foramen:• Obturator internus muscle tendon• Pudendal nerve and internal pudendal   vessels pass into perineum    from gluteal regionGreater sciatic foramen below piriformis muscle:• Sciatic nerve• Inferior gluteal nerve, artery, vein• Pudendal nerve• Internal pudendal artery and vein• Posterior femoral cutaneous nerve• Nerve to obturator internus and    gemellus superior muscles• Nerve to quadratus femoris and    gemellus inferior musclesGreater sciatic foramen abovepiriformis muscle:• Superior gluteal nerve, artery, veinPiriformis muscle