Nervous System: A complex network of nerves and cells that transmit signals throughout the body, controlling movements, thoughts, sensations, and basic bodily functions. It includes the brain, spinal cord, and peripheral nerves. Illnesses/Conditions: Multiple sclerosis, Parkinson’s disease, Alzheimer’s disease, epilepsy, neuropathy, stroke, brain tumors. Specialists: Neurologists, neurosurgeon, psychiatrists.