Watershed zone of large intestine ?: (A) Cecum, (B) Ascending colon, (C) Rectosigmoid, (D) Transverse colon
Answer is C. There are areas of colon with poor blood supply resulting from incomplete anastomosis of marginal aeries. These are watershed areas of colon and include :Splenic flexure (Griffith point) : Watershed area between superior mesenteric aery and inferior mesenteric aery.Rectosigmoid junction (Sudeck's point) : Watershed zone between inferior mesenteric aery and internal iliac aery.