Esophageal Sphincter, LowerEsophageal Sphincter, UpperEsophagogastric JunctionManometryDeglutitionSphincter of OddiEsophagusPeristalsisPressureEsophageal AchalasiaGastroesophageal RefluxOpossumsDeglutition DisordersMuscle RelaxationAnal CanalEsophageal pH MonitoringEsophageal Motility DisordersEsophagitisCricoid CartilagePharyngeal MusclesMuscle, SmoothMuscle ContractionMuscle TonusPharynxEsophagoscopyFundoplicationEsophageal DiseasesLaryngeal MusclesFluoroscopyHernia, HiatalStomachDiverticulum, EsophagealDidelphisSphincter of Oddi DysfunctionGastrointestinal 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