Myenteric PlexusChoroid PlexusSubmucous PlexusIleumEnteric Nervous SystemBrachial PlexusGuinea PigsCircular DichroismNitrergic NeuronsDNA, CircularGastrointestinal MotilityInterstitial Cells of CajalMuscle, SmoothNADPH DehydrogenaseColonCholine O-AcetyltransferaseIntestine, SmallVasoactive Intestinal PeptideHexamethoniumNeuronsMegacolonGangliaColon, DescendingCalbindin 2StomachChoroid Plexus NeoplasmsElectric StimulationSubstance PAcetylcholineCalbindinsDihydrolipoamide DehydrogenaseS100 Calcium Binding Protein GEsophageal AchalasiaCeliac PlexusLumbosacral PlexusCervical PlexusTetrodotoxinJejunumDimethylphenylpiperazinium IodideIntestinal Pseudo-ObstructionAtropineMorphinansMuscle ContractionImmunohistochemistryReceptors, Serotonin, 5-HT4Ganglia, AutonomicPyloric AntrumNaloxoneEsophagusEnkephalin, MethionineSerotonin 5-HT4 Receptor AgonistsSerotoninNitric Oxide Synthase Type IPeristalsisHexamethonium CompoundsPyloric StenosisReceptors, OpioidVagus NerveUbiquitin ThiolesteraseDigestive SystemIntestinesHirschsprung DiseaseGastric FundusParasympatholyticsNitric Oxide SynthaseDuodenumPapilloma, Choroid PlexusGastrointestinal TractPylorusIntestinal MucosaNarcotic AntagonistsSynaptic TransmissionAction PotentialsQuinacrineGanglionic BlockersMorphineElectrophysiologyParasympathetic Nervous SystemRectumHypogastric PlexusScopolamine HydrobromideProto-Oncogene Proteins c-kitPiperidinesRats, Sprague-DawleyProtein DeficiencyEndorphinsCell Count