Types of Sphincters

An anal sphincter is a group of muscles at the end of the rectum that surrounds the anus and controls the release of stool, thereby maintaining continence. There are two sphincter muscles: one is internal and one is external.

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The cardiac sphincter, also referred to as the lower esophageal sphincter (LES), is a valve found in the esophagus, the tube responsible for transporting foods and liquids to the stomach from the mouth.This particular valve is located just between the bottom of the esophagus and the stomach. A sphincter is a specialized type of muscle with an opening that relaxes and contracts, allowing this ...

The pyloric sphincter is a thin, circular band of visceral muscle surrounding the pyloric opening at the inferior end of the stomach. It is found at the border of the stomach’s final segment, the pylorus, and the small intestine’s first segment, the duodenum.

What do the sphincters of the GI ... Which sphincter is located between mouth and esophagus? ... Where does the bolus pass through after upper esophageal sphincter?