Where is the pelvis ? Learn about its anatomy, the organs of the pelvic region, and their functions. Explore common conditions and more. The pelvis is the lower part of the trunk, between the abdomen and the thighs, that includes the bony pelvis, the pelvic cavity, the pelvic floor, and the perineum. The bony pelvis is formed by the sacrum, the coccyx, and the hip bones, and the pelvic cavity contains the reproductive organs and the rectum. Experiencing pelvic pain? Discover the Possible Reasons for Pelvic Pain, from ovulation to infections to chronic conditions like endometriosis and fibroids. Learn about the bony structure, joints and organs of your pelvis, the seat of your trunk and legs. Find out how pelvic shape and sex affect your pelvic anatomy and health.