Massive colonic bleeding in a patient of diverticulosis is from
1.Inferior mesentric artery
2.Superior mysentric artery
4.Gastro duodenal artery
Although diverticulosis involves mainly the left side of colon, bleeding occurs mostly from right side of colon. Right side is supplied by superior mesentric artery.
“Hemorrhage from a colonic diverticula is the most common cause of hematochezia in patients over the age of 60.” - Harrison 16/e, p 1796