When approaching a patient with a neurologic disorder always ask yourself: where is the lesion?,cerebrum, cerebellum, brainstem, spinal cord, nerve root, peripheral nerve, neuromuscular junction, muscle, not confined to one level. What is the cause of the lesion?, vascular, infectious, neoplastic, degenerative, inflammatory-immunologic, congenital-developmental, autoimmune, toxic/ traumatic, endocrine/ metabolic