Multiple System AtrophyBasal GangliaOlivopontocerebellar AtrophiesShy-Drager SyndromeBasal Ganglia DiseasesSupranuclear Palsy, ProgressivePutamenParkinson Diseasealpha-SynucleinGangliaAutonomic Nervous System DiseasesRetinal Ganglion CellsBasal Ganglia HemorrhageGanglia, SpinalGlobus PallidusCerebellar AtaxiaSynucleinsHypotension, OrthostaticGanglia, SympatheticParkinsonian DisordersGanglia, AutonomicParkinson Disease, SecondaryTrigeminal GanglionBrainBasal Ganglia Cerebrovascular DiseaseInclusion BodiesMagnetic Resonance ImagingGanglia, ParasympatheticNeuronsSubstantia NigraGanglia, SensoryLewy Body DiseaseCorpus StriatumThioninsMidodrineCaudate NucleusDiagnostic Techniques, NeurologicalStriatonigral DegenerationSubthalamic NucleusLevodopaNeural PathwaysPure Autonomic FailureAtrophyCerebellumVocal Cord ParalysisStellate GanglionLewy BodiesSpinocerebellar DegenerationsTonic PupilThalamusBrain StemSpiral GanglionAntiparkinson AgentsHeredodegenerative Disorders, Nervous SystemNerve DegenerationNodose GanglionOligodendrogliaNeurodegenerative DiseasesExtrapyramidal TractsDystoniaGait AtaxiaNerve Tissue ProteinsRecurrent Laryngeal NerveSweat Gland DiseasesDihydroxyphenylalanineChoreaGanglia, InvertebrateNeurologic ExaminationSuperior Cervical GanglionBrain DiseasesMovement DisordersREM Sleep Behavior DisorderCerebellar DiseasesLaryngoscopyAutonomic Nervous SystemElectromyographyTyrosine 3-MonooxygenaseAction PotentialsEntopeduncular NucleusDopamineImage Processing, Computer-AssistedEphedrineCebusPonsSalicylamidesCerebral CortexBrain MappingNeostriatumAtaxiaDystonic DisordersImmunohistochemistryDeep Brain StimulationAnalysis of VarianceTomography, Emission-Computed, Single-PhotonVocal CordsDisease Models, AnimalNeuropsychological TestsTime FactorsHypokinesiaRetina