Why the IBS.. Abnormal movement and nerve contractions of the walls of the colon and not because of mental and neurological status that accompanies irritable bowel patient NIL NAM December 20, 2015 It is likely that abnormal movement and contractions nerve to the walls of the colon is the reason for naming IBS that name and not because of mental and neurological status that accompanies irritable bowel patient, he believes the general public. Share This: Facebook Twitter Google+ Stumble Digg