Colonic DiseasesCrohn DiseaseColonEnemaColitis, UlcerativeRectumColonoscopyIntestinal MucosaColonic Diseases, FunctionalSciatic NerveColonic NeoplasmsPeripheral NervesOptic NerveNerve FibersNerve RegenerationNerve BlockNerve EndingsSural NerveMedian NerveFacial NerveNerve CrushPeripheral Nerve InjuriesTibial NerveUlnar NerveColonic PolypsFemoral NerveSpinal NervesNerve Growth FactorTrigeminal NerveNerve Growth FactorsPhrenic NerveRadial Nerve