What is an Atypical Parkinsonian Disorder? -- Historical Issues and Atypical Parkinsonian Disorders -- Epidemiology of Progessive Supranuclear Palsy and Multiple System Atrophy -- Neuropathology of Atypical Parkinsonian Disorders -- Animal Models of Tauopathies -- Neurodegenerative ?-Synucleinopathies -- Computer Modeling in Basal Ganglia Disorders -- Atypical Parkinsonian Disorders -- Genetics…