Episode 89 covers two of the most common neurological diseases of aging, Alzheimer and Parkinson disease. I know it sounds odd without the possessive, but that's the standard when it's written. These diseases are often reduced to "dementia" and "tremors," but there is so much more to their mechanisms, signs, symptoms, findings, treatments, and prognoses. We discuss the anatomical background needed to understand these diseases and their clinical significance.