The spine, or columna vertebralis, is the bone structure consisting of vertebrae and containing the spinal cord.

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It is to carry the weight of the head, trunk, many internal organs in the thoracic and abdominal cavities and to be a solid support for them. It also provides movements of the head and trunk. Meanwhile, it forms a solid and safe sheath for a very important organ such as the spinal cord in the spinal canal.

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The spine is made up of 33-34 vertebrae in humans. The first 24 of these vertebrae are connected to each other through joints with cartilages called intervertebral discs. These vertebrae are divided into three groups. These are 7 neck vertebrae, 12 dorsal vertebrae and 5 lumbar vertebrae. The coccyx was formed by the fusion of the first five of the remaining 9-10 vertebrae, and the tailbone was formed by the fusion of 4-5 small and underdeveloped vertebrae at the bottom.