Neurology is the branch of medical specialty that deals with disorders of the nervous system, which include the brain, blood vessels, muscles and nerves. The term neurology comes from a combination of two words "neuron" meaning nerve and "logia" meaning "the study of". The main areas of neurology are: the autonomic, central and peripheral nervous systems. A doctor who specializes in neurology is called a neurologist. The neurologist treats disorders that affect the brain, spinal cord, and nerves, such as: Cerebrovascular disease and stroke.