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The backbone, or spinal column, consists of a series of bones called vertebrae, that connect the skull to the pelvis. The vertebrae are separated and cushioned by discs, which are filled with a jelly-like substance that acts as a shock absorber between each vertebrae.

Nestled inside a channel running from the brain to the base of the spine is the spinal cord. From the spinal cord, nerves branch out to the arms, legs and other parts ... more