Pertaining to the brain, cranial nerves and spinal cord. It does not include muscles or peripheral nerves.

The central nervous system (CNS) is made up of the spinal cord and brain. The brain receives nerve impulses from the spinal cord and cranial nerves. The spinal cord contains the nerves that carry messages between the body and the brain. Spinal cord injury occurs when there is damage to the cells within the spinal cord or the nerves of the spinal cord are severed.