Spine. Computer illustration showing a spine highlighted against a silhouetted male human figure seen from the back. The spine is made of a column of 33 cylindrical bones called vertebrae which support the trunk and head and protect the spinal cord. Between the vertebrae are flexible joints that both stabilise the spine and allow movement. Each vertebra has bony projections (on the left and right sides of the vertebrae) 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 column of nerve tissue from the brain.
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