ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Normal spine. Coloured 3D computed tomography (CT) scan of the rear of the healthy lumbar (lower back) spine of a 28-year-old, showing the normal structure of the lumbar vertebrae (L1-L5), and intervertebral discs, with the top of the pelvis (bottom) visible below. Each vertebra consists of the vertebral body and three processes, with two projecting out either side and one to the back.
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