👉 Sphincteristomum is a type of muscle tissue in the human body that primarily functions to control and close the passage through the gastrointestinal (GI) tract, particularly in the small intestine, ensuring proper digestion and absorption. It plays a crucial role in maintaining the integrity of the digestive system by controlling the flow of food from the mouth to the stomach, where nutrients are absorbed into the bloodstream, and then into the large intestine where they pass through the colon and ultimately to the rectum,