The Spinal Column is one of the vital parts of the human skeleton that extends down the center of the back. To it are attached the skull, shoulder bones, ribs, and pelvis. The Spine Column is a flexuous and flexible column formed of a series of bones called vertebrae. The spine plays an important role in posture and movement, and it also protects the spinal cord. It is also called a vertebral column, spine, or backbone.
The human spine contains 32-34 vertebras: 7 cervical vertebrae in the neck; 12 thoracic, or dorsal, vertebrae in the region of the chest, or thorax, providing attachment for 12 pairs of ribs; 5 lumbar vertebrae in the small of the back; 5 fused sacral vertebrae forming a solid bone, the sacrum, which fits like a wedge between the bones of the hip; and a variable number of vertebrae fused together to form the coccyx at the bottom of the sacrum. The vertebrae are held in place by muscles and strong connective tissue called ligaments. Most vertebrae have fibrous intervertebral discs between them to absorb shock and enable the spine to bend.