Esophageal Sphincter, LowerEsophageal Sphincter, UpperEsophagogastric JunctionManometryPeristalsisDeglutitionEsophagusMuscle RelaxationPressureGastroesophageal RefluxOpossumsEsophageal AchalasiaSphincter of OddiMuscle ContractionEructationEsophageal pH MonitoringAnal CanalEsophagitisEsophageal Motility DisordersDeglutition DisordersMuscle, SmoothCricoid CartilageMuscle TonusStomachFundoplicationEsophagoscopyGastrointestinal MotilityAtropineHernia, HiatalEsophageal DiseasesDidelphisMotilinPharyngeal MusclesDiverticulum, EsophagealEsophagitis, PepticEsophageal StenosisGastrinsPharynxBethanecholCatsMethacholine CompoundsCatheterizationHexamethonium CompoundsLaryngeal MusclesFluoroscopyDilatationBaclofenHydrogen-Ion ConcentrationPhentolamineCisaprideVagus NerveSphincter of Oddi DysfunctionBarrett EsophagusPropranololFecal Incontinence