<prompt> Colon is supplied by all except -Inferior mesenteric arteryIleocolic arteryMiddle colic arteryInternal iliac artery  <response>: Ans. is d i.e., Internal iliac arteryo The blood supply of colon is derived from the marginal artery of Drummond. It is a paracolic anastomotic artery formed by anastomosis between colic branches of superior mesentric artery ileocolic, right colic, middle colic and colic branches of inferior mesenteric artery left colic and sigmoidal arteries. Terminal branches from marginal artery are distributed as long and short vessels vasa tonga and vasa bravia.o There are areas of colon with poor blood supply resulting from incomplete anastomosis of marginal arteries. These are watershed areas of colon and include :Splenic flexure Griffith point: Watershed area between superior mesenteric artery and inferior mesenteric artery.Rectosigmoid junction Su decks point : Watershed zone between inferior mesenteric artery and internal iliac artery. 