Neurology is a branch of medicine which deals with certain disorders of the nervous system. There are about more than 600 neurological diseases. Major types of neurologic diseases occur due to faulty genes, or injuries to the spinal cord or brain. The physical symptoms of neurologic diseases include partial or complete paralysis, muscle weakness etc. The medical specialty concerned with the diagnosis and treatment of disorders of the nervous system, which includes the brain, the spinal cord, and the nerves. A neurologist is a doctor who specializes in treating diseases of the nervous system, which includes the brain and spinal cord.