When you breathe, think, laugh or lift your finger, your brain and nerves are communicating through electrical impulses transmitted by nerve cells. Neurology involves your entire nervous system -- the internal wiring that controls your body's function and movement. When an illness or injury disrupts the proper working of this complex system, chances are you'll need to see a neurologist. Your primary care provider will refer you to a neurologist who will provide principal care to patients with neurological disorders such as Parkinson’s disease, Alzheimer’s disease, multiple sclerosis or stroke.