Mass movement of the colon would be abolished by
Extrinsic denervation
Distension of the colon
Gastrocolic reflex
Destruction of auerbach's plexus
Mass movements are special type of peristaltic contractions which are observed in colon only. A mass movement can be initiated by Gastrocolic reflex Intense stimulation of parasympathetic nerves Overdistension of a segment of colon Gastrocolic reflex refers to contraction of colon induced by entry of food into the stomach. This reflex results in an urge to defecate after a meal. Gastrocolic reflexes results from distension of stomach & duodenum & these are transmitted by way of autonomic nervous system. Trypanosoma cruzi, a species of parasitic euglenoid protozoan causes destruction of Auerbach&;s plexus in walls of colon which leads to the blockage of both the peristalsis & mass contractions. Therefore, the feces pass with difficulty & get accumulated in large intestine leading to dilatation of colon (megacolon). Reference: Medical Physiology, Indu Khurana
G.I.T