Only the top 24 bones are moveable the vertebrae of the sacrum and coccyx are fused. The vertebrae are numbered and divided into regions:Ĭervical, thoracic, lumbar, sacrum, and coccyx (Fig. Vertebrae are the 33 individual bones that interlock with each other to form the spinal column. Misalignment puts incredible strain on the spine (see Exercise for a Healthy Back). Something as common as poor muscle tone or a large belly can pull your entire body out of alignment. These muscles enable us to flex, or bend forward, and are important in lifting and controlling the arch in the lower back. The flexor muscles are in the front and include the abdominal muscles. The extensors are attached to the back of the spine. The extensor muscles enable us to stand up and lift objects. The two main muscle groups that affect the spine are extensors and flexors. An abnormal curve from side-to-side is called scoliosis.An abnormal curve of the thoracic spine is kyphosis, also called hunchback. ![]()
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