Medical Definition of rectal artery
: any of three arteries supplying especially the rectum:a: one arising from the internal pudendal artery and supplying the lower part of the rectum and the perineal region—called also inferior hemorrhoidal artery, inferior rectal arteryb: one arising from the internal iliac artery and supplying the middle part of the rectum—called also middle hemorrhoidal artery, middle rectal arteryc: one that is a continuation of the inferior mesenteric artery and that supplies the upper part of the rectum—called also superior hemorrhoidal artery, superior rectal artery
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