The dilated terminal part of the rectum is referred to as what?

The dilated terminal part of the rectum is referred to as the ampulla. This anatomical feature is significant because it serves as a reservoir for fecal matter before elimination. The structure of the ampulla allows it to expand and collect stool, which facilitates the process of defecation by signaling to the body when it is appropriate to expel its contents. Understanding the ampulla's role in the rectum is essential for grasping the anatomy and function of the lower gastrointestinal tract. The other options reference different parts or functions in the digestive system, but only the ampulla accurately describes the specific dilated region at the end of the rectum.