A physician who practices in neurology is called a neurologist. The neurologist treats all categories of conditions and disease involving the central and peripheral nervous system (and its subdivisions, the autonomic nervous system and the somatic nervous system); including their coverings, blood vessels, and all effector tissue, such as muscle. Neurologists may also be involved in clinical research, clinical trials and basic or translational research. While neurology is a non-surgical specialty, its corresponding surgical specialty is neurosurgery. During a neurological examination, the neurologist reviews the patient's health history with special attention to the current condition.