ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Rear of pelvis and base of spine. Coloured 3D posterior (rear) computed tomography (CT) scan of the pelvic region of a 38-year-old woman, showing the bones of the pelvis, and the sacrum (centre) and the sacroiliac joints at the base of the spine. The bones of the pelvis articulate with the femur bones (lower right and lower left) to form the hip joints. The rear of the pelvis is formed of the sacrum and the coccyx. The main pelvic bones are known as the coxal bones, and consist of the ilium, ischium, and pubis.
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