Alzheimer's: progressive degenerative disease, dementia bc neurofibillaruy tangles inside neuron, transport mechanisms interfered (memory loss, short attention span, disorientation, language loss, moodiness) Parkison's degeneration od DOPAMINE, basal nuclei deprived of dopamine, = overacting TREMORS Huntington's: FATAL hereditary disorder caused by accumulation of protein, Huntington in brain cell, degeneration of basal nuclei & cerebral cortex