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Related to rectal artery: Middle hemorrhoidal branches
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These branches anastomose superiorly with the branches from the left colic artery and inferiorly with the branches from superior rectal artery.
Another similar zone is the distal sigmoid colon, supplied on one hand by the inferior sigmoid arteries, and on the other hand by the superior rectal artery (Sonneland, Anson, and Beaton, 1958).
Concerning the caudal mesenteric artery, which bifurcates into a left colic artery and a cranial rectal artery, the findings by Barone et al.