Water-shed area of inferior mesenteric aery and internal iliac aery lies at

Sudeck's point is an area prone to ischemia where anastomoses between distal branches of inferior mesenteric aery and internal iliac aery occurs which gives middle and inferior rectal aery which supplies pelvis and perineum. Griffiths' point is defined as the site of (a) communication of the ascending left colic aery with the marginal aery of Drummond, and (b) anastomotic bridging between the right and left terminal branches of the ascending left colic aery at the splenic flexure of the colon Watershed area is the term referring to regions of the body that receive dual blood supply from the most distal branches of two large aeries, such as the splenic flexure of the large intestine. During times of blockage of one of the aeries that supply the watershed area, such as in atherosclerosis, these regions are spared from ischemia by viue of their dual supply.