substantia nigra, a basal banglia of the midbrain, in parkinson's disease, 3d

substantia nigra midbrain 3d brain illustration system anatomical medicine anatomy black background concept conceptual degeneration 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