MS-1373

A 58-year-old woman diagnosed with squamous cell carcinoma of the anus is preparing for an abdominoperineal resection (APR). This surgical procedure involves the complete removal of the distal colon, rectum, and anal sphincter complex through both anterior abdominal and perineal incisions, resulting in a permanent colostomy. During the process, several arteries are ligated, including the one that supplies the anal canal below the levator ani. Can you identify the name of this artery and its branching point?