3-IodobenzylguanidineIodobenzenesSympathetic Nervous SystemEphedrineIodine RadioisotopesSympathetic Fibers, PostganglionicAutonomic Nervous System DiseasesPure Autonomic FailureHeartPheochromocytomaAdrenal Gland NeoplasmsRadiopharmaceuticalsAdrenergic FibersSympathectomy, ChemicalSympathectomyGanglionectomySweat GlandsStellate GanglionDenervationNorepinephrineSuperior Cervical GanglionHydroxydopaminesParasympathetic Nervous SystemMyocytes, CardiacSplanchnic NervesNerve Growth FactorNaphthylvinylpyridineTyrosine 3-MonooxygenaseGanglia, SympatheticOxidopamineArrhythmias, CardiacMetipranololParasympathectomyNeurons, EfferentSympathomimeticsMyocardiumDihydroergotamineCardiac OutputAnimals, NewbornSemaphorin-3ASympatholyticsCatecholaminesNADH Tetrazolium ReductaseNerve Growth FactorsTyramine