Esophageal Sphincter, LowerEsophageal Sphincter, UpperEsophagogastric JunctionManometryDeglutitionSphincter of OddiEsophagusPeristalsisPressureEsophageal AchalasiaOligomenorrheaOpossumsDeglutition DisordersMuscle RelaxationAnal CanalEsophageal pH MonitoringEsophageal Motility DisordersEsophagitisCricoid CartilagePharyngeal MusclesMuscle, SmoothMuscle ContractionMuscle TonusPharynxEsophagoscopyFundoplicationEsophageal DiseasesLaryngeal MusclesFluoroscopyOxyurida InfectionsStomachDiverticulum, EsophagealDidelphisrhoB GTP-Binding ProteinGastrointestinal MotilityMotilinAtropineEsophagitis, PepticFecal IncontinenceEsophageal StenosisGastrinsUrinary Sphincter, ArtificialCatsCatheterizationEructationDilatationBethanecholMethacholine CompoundsAnti-Dyskinesia AgentsHexamethonium CompoundsUrethraPhentolamineHydrochloric AcidVagus NerveBarrett EsophagusReflexEndoscopy, GastrointestinalElectric StimulationPropranololSecretinIrisCommon Bile Duct DiseasesDogsBaclofenVideo RecordingHydrogen-Ion ConcentrationLaparoscopyAmpulla of VaterLacerationsAcetylcholineAnus DiseasesRectumUrodynamicsFissure in AnoNitric Oxide