IleumGuinea PigsMyenteric PlexusIleal DiseasesMuscle, SmoothIleitisIntestine, SmallIntestinal MucosaMuscle ContractionIleal NeoplasmsIntestinal AbsorptionTime FactorsIntestinesColonGastrointestinal MotilityDuodenumDiphenylacetic AcidsIleocecal ValveAtropineSwineAcetylcholineElectric StimulationCecumPeristalsisCurriculumRabbitsGastrointestinal ContentsCrohn Disease