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When young the spine is made up of 33 bones stacked one on top of the other until the adolescence.  A fully grown adult ends up with 24 bones when the sacral’s bones (5 vertebrae) and the coccyx (4 vertebrae) fuse together. 

These remaining 24 vertebrae are classified as follows:

  • 7 cervical vertebrae.
  • 12 thoracic vertebrae.
  • 5 lumbar vertebrae.

There are approximately 220 ligaments, 120 muscles that are related to controlling the motion of the spine.