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muscle anal The anal sphincter is made up of sets of muscles called the "internal" and "external" sphincters. These muscles form a ring around the anus.. Stay connected and never miss any 18+ videos and photos by following our Telegram channel. The external anal sphincter (or sphincter ani externus is an oval tube of skeletal muscle fibers. Distally, it is adherent to the skin surrounding the. muscle anal Watch the highest-rated adult content—accessible only through our Telegram channel. Click "open" and join our channel to never miss out on any of the action! Discover a hidden gem of sizzling adult content created exclusively for your enjoyment. Internal anal sphincter muscles: The inner ring of muscles. It works all the time to keep the stool (poo in and relaxes when opening your do not.