Spine. Coloured three-dimensional computed tomography (CT) scan of a healthy human spine, superimposed onto a male torso. The spine (yellow) is made of a column of 33 cylindrical bones called vertebrae. Between the vertebrae are flexible joints that both stabilise the spine and allow movement. Each vertebra has bony projections which provide attachment sites for the muscles and ligaments that hold the spine together. Running through the spine is the spinal cord (not seen), a bundle of nerves from the brain. The pelvis is at centre bottom. Three-dimensional CT scans are made by combining multiple X-ray tissue "slices" using a computer.
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