肠糸膜下动脉 inferior mesenteric artery (约干对第3高度腰椎 Middle colIc artery Superior senter 左结肠动脉 Right artery colIC artery 蠊乙状结肠动脉 ileocolic 直肠上动脉 artery Common trunk for ght colic and middle肠系膜下动脉 inferior mesenteric artery  左结肠动脉  乙状结肠动脉  直肠上动脉 (约平对第3高度腰椎)