Background: Branching pattern of inferior mesenteric artery (IMA) and patterns of vascular supply to the left colon and rectosigmoid areas, though important during colorectal surgery. This study aimed to determine the rate of the branching pattern of IMA observed in laparoscopic colorectal surgery. Materials and Methods: Thirty - two cases (15 males, 17 females) were studied and determined branching pattern of inferior mesenteric artery (IMA). Results: IMA frequently branched into left colic artery and a common sigmoid trunk (Type SS) in 13 cases (40.6 percent), the second rate of branching Pattern of IMA had a common trunk of three branch (Type V) in 10 cases (31.3 percent), the third rate of branching pattern of IMA branched into surperior rectal artery and a common left colic trunk (Type Y) in 7 cases (21.9 percent), and the lowest rate was absent the left colonic artery (Type Kh) in 2 cases (6.2 percent). Conclusion: A detailed knowledge of the colorectal blood supply and its variations is necessery for performing a safe and efficient laparoscopic colorectal surgery.
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