The spinal structure, or spine, is a column of bones called vertebrae that extends from the base of the skull to the lower back. It consists of 33 individual vertebrae, which are divided into five regions: cervical (neck), thoracic (upper back), lumbar (lower back), sacral (pelvic area), and coccygeal (tailbone). These vertebrae are separated by intervertebral discs that provide cushioning and flexibility. The spine serves several important functions, including protecting the spinal cord, which runs through the center of the vertebrae. It also supports the head and allows for a range of movements, such as bending and twisting. Additionally, the spine plays a crucial role in maintaining posture and balance in the body.