an old man with parkinson's disease and highlighted brain and black substance of the midbrain

substantia nigra midbrain 3d brain illustration system anatomical medicine anatomy black concept lewy conceptual body degeneration inclusion medical dementia destruction isolated development neurology disease disorder dopaminergic inflammation nervous model multiple atrophy parkinson nerve cell neurodegeneration neurodegenerative neurological neuron neuronal neurone alzheimer pars compacta huntington progressive wooden chest syndrome substance basal ganglia levodopa old man