Sphincter Ani is a term that refers to the muscular ring that surrounds the anal canal. There are several synonyms for Sphincter Ani, including anal sphincter, rectal sphincter, and anal ring. While all of these terms describe the same anatomical structure, they are used interchangeably based on the context. The Sphincter Ani is responsible for controlling bowel movements and maintaining the integrity of the anal canal to prevent leakage of stool. Understanding the anatomy and function of this important structure is critical in the diagnosis and management of conditions affecting the gastrointestinal tract.