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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.
Your spine is made up of 33 irregularly shaped bones called vertebrae. Each vertebra has a hole in the middle through which the spinal cord runs. The spinal cord can be divided into five different regions, from top to bottom: Your ribs attach to your 12 thoracic vertebrae. 2  Your five sturdy lumbar vertebrae carry most of the weight of your upper body and provide a stable centre of gravity when you move. 3  Your sacrum is made up of five fused vertebrae.