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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 spinal cord can be divided into segments according to the nerve roots that branch off of it. Nerves along the cord consists of 8 cervical nerves, 12 thoracic nerves, 5 lumbar nerves, 5 sacral nerves, and 1 coccygeal nerve.The nerve roots run through the bony canal, and at each level a pair of nerve roots exits from the spine.Article continues below. 1  Cervical spine nerve roots.he spinal cord can be divided into segments according to the nerve roots that branch off of it. Nerves along the cord consists of 8 cervical nerves, 12 thoracic nerves, 5 lumbar nerves, 5 sacral nerves, and 1 coccygeal nerve.