Spinal disease refers to a condition impairing the backbone. These include various diseases of the back or spine, such as kyphosis. Dorsalgia refers to those conditions causing back pain. The spine consists of the spinal cord, which is a group of nerves that are protected by the individual vertebrae of the spine. The main function of the spinal cord is to send signals from the brain to other regions of the body. It is the main messenger throughout the body. Spinal cord injuries can either be complete or incomplete. If sensations and movements are lost below the injured area, the injury is complete.