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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.. Follow our Telegram channel for instant access to all 18+ videos, photos, and more. 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 Join now for instant access to the finest selection of adult content, only on our Telegram channel. 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. Press the "open" button to follow us and dive into all the exciting content we offer. Your gateway to the ultimate collection of steamy adult content is just one click away! The internal anal sphincter, IAS, or sphincter ani internus is a ring of smooth muscle that surrounds about .–. cm of the anal canal.