Ganglia, SpinalCarotid Artery, ExternalCarotid ArteriesCarotid StenosisSpinal CordCarotid Artery DiseasesGangliaCarotid Artery, InternalNeurons, AfferentRetinal Ganglion CellsEndarterectomy, CarotidNeuronsBasal GangliaCarotid Artery, CommonGanglia, SympatheticGanglia, AutonomicTrigeminal GanglionChick EmbryoCarotid BodyGanglia, ParasympatheticGanglia, SensoryCarotid SinusStellate GanglionCarotid Artery ThrombosisSpinal Cord InjuriesMetergolineSpiral GanglionNodose GanglionMaxillary ArteryCerebral AngiographyCarotid Artery InjuriesSuperior Cervical GanglionGanglia, InvertebrateCarotid Body TumorCarotid Intima-Media ThicknessEndarterectomyUltrasonography, Doppler, DuplexBasal Ganglia DiseasesVertebral Artery5-MethoxytryptamineCerebral RevascularizationTunica IntimaRetinaTunica MediaGeniculate GanglionAmaurosis FugaxCerebrovascular CirculationEmbolization, TherapeuticCavernous SinusIschemic Attack, TransientAxonsAngiography, Digital SubtractionAngiographySympathectomyStentsNeckSpinal NervesRats, Sprague-DawleyTime FactorsArterial Occlusive DiseasesSumatriptanBlood Flow VelocityCarotid Artery, Internal, DissectionMagnetic Resonance AngiographyInjections, SpinalCollateral CirculationCerebrovascular DisordersArteriosclerosisSpinal Nerve RootsAction PotentialsTomography, X-Ray ComputedCentral Nervous System Vascular MalformationsDissectionMagnetic Resonance ImagingAngioplasty, BalloonMeningeal ArteriesBrainEpistaxisAutonomic Fibers, PreganglionicLigationSpinal Cord DiseasesOptic NerveDisease Models, AnimalIntracranial Embolism and ThrombosisDenervationAnesthesia, SpinalMethiothepinBrain IschemiaArteriovenous FistulaCatsRegional Blood FlowDura MaterTreatment OutcomeCerebral ArteriesUltrasonography, Doppler, TranscranialBlood PressureDogsSerotonin Receptor AgonistsInjections, Intra-ArterialSpinal Cord Neoplasms