JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY
Healthy lower back, coloured X-ray. The spine runs down centre. It is made up of block-shaped bones called vertebrae. At its base it is fused to the pelvis (lower frame), which supports the upper body. At top is the base of the ribcage, which encloses the heart and lungs (not seen).
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