Nervous system is the entire nerve apparatus, composed of a central part, the brain and spinal cord, and a peripheral part, the cranial and spinal nerves, autonomic ganglia, and plexuses. Diseases of the nervous system include diseases of the central and peripheral nervous system. This includes disorders of the brain, spinal cord, cranial nerves, peripheral nerves, nerve roots, autonomic nervous system, neuromuscular junction, and muscle. (Description adapted from https://www.ncbi.nlm.nih.gov/mesh/68009420 and https://www.ncbi.nlm.nih.gov/mesh/68009422).