The backbone (or spine) extends from the base of the skull down to the hips.
The backbone is not a single bone, but a column of drum-shaped bones called vertebrae (singular, vertebra).
The backbone is not a single bone, but a column of drum-shaped bones called vertebrae (singular, vertebra).
There are 33 vertebrae altogether, although some of these fuse or join as the body grows.
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Each vertebra is linked to the next by facet joints, which are like tiny ball-and-socket joints.
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The vertebrae are separated by discs of rubbery material called cartilage. These cushion the bones when you run and jump.
The bones of the spine are divided into five groups from top to bottom. These are the cervical
(7 bones), the thoracic (12 bones), the lumbar
(7 bones), the thoracic (12 bones), the lumbar
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The backbone is not straight - instead, its 33 vertebrae curve into an S-shape.
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