Bony pelvis Sacrum(骶骨 CHAPTER 3 Embryology. Anatomy, and Reproductive Genetics Sacroiliac joint Anterior superior iliac spine Coccyx(尾骨 Greater sciatic foramen Inguinal ligament Linea terminalis Ischial spine Lesser sciatic foramen Coxae(髋骨 Sacral foramen Obturator foramen Obturator membrane