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muscle anal If you have weak muscles you may leak gas, liquid or solid stools. When you pass a stool, there is usually some residue of the stool left behind in the anal.. Get immediate access to all our 18+ videos and photos—subscribe now! The internal anal sphincter (IAS is a continuation of the rectal muscle under autonomous control and is responsible for maintaining anal continence at rest. muscle anal One click is all it takes to unlock high-quality adult content—subscribe to our Telegram channel now! Tap "open" to become part of our vibrant community by subscribing to our channel. Ringlike muscles called sphincters surround your anus and keep it closed until they're activated to let your poop come out. What is the. Get ready to explore a world of the hottest adult content—right at your fingertips. The internal anal sphincter, IAS, or sphincter ani internus is a ring of smooth muscle that surrounds about .–. cm of the anal canal.