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The spine, also known as the vertebral column or backbone, is a bony structure in the human body that runs from the base of the skull to the pelvis. It is composed of a series of vertebrae, which are stacked on top of each other and separated by intervertebral discs. The spine plays a crucial role in supporting the body, protecting the spinal cord, and allowing for various types of movement. It is divided into different regions, including the cervical (neck), thoracic (upper back), lumbar (lower back), sacral, and coccygeal regions.