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marginal artery of Drummond

(marginal artery of the colon) A major anastomotic network between the superior and inferior mesenteric arteries. It vascularizes the transverse and descending colons and is a major contributor to the collateral circulation of left-colic structures. Collateral circulation is alternate or "backup" blood vessels in the body that can take over when another artery or vein becomes blocked or damaged. It provides alternative routes for blood flow. Collateral blood vessels connect to the main blood vessels and remain small and unused until they are needed. Angiogenesis may happen as a main blood vessel slowly becomes blocked. The body senses the reduced blood flow and calls other blood vessels into action. Regular aerobic exercise, such as running, may also encourage new collateral blood vessels to form. Cf. Arc of Riolan