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Anatomy of the Spine. The normal anatomy of the spine is usually described by dividing up the spine into three major sections: the cervical, the thoracic, and the lumbar spine. (Below the lumbar spine is a bone called the sacrum, which is part of the pelvis). Each section is made up of individual bones, called vertebrae. There are 7 cervical vertebrae, 12 thoracic vertebrae, and 5 lumbar vertebrae. An individual vertebra is made up of several parts.
The first seven vertebrae form the cervical spine . The mid back, called the thoracic spine , consists of 12 vertebrae. The lower portion of the spine, called the lumbar spine , is usually made up of five vertebrae. However some people have a sixth lumbar vertebra. The normal spine has an S-like curve when looking at it from the side. This allows for an even distribution of weight.