Ganglia, ParasympatheticGanglia, AutonomicParasympathetic Nervous SystemGanglionic BlockersNeuronsVagus NerveAcetylcholineGangliaCatsGuinea PigsRetinal Ganglion CellsSynaptic TransmissionMembrane PotentialsGanglia, SpinalAction PotentialsElectrophysiologyBasal GangliaElectric StimulationGanglia, SympatheticHeartTrigeminal GanglionGanglia, SensoryStellate Ganglion