Final answer:
The pylorus is the region of the stomach that adjoins the small intestine and is controlled by the pyloric sphincter.
Step-by-step explanation:
The area of the stomach that adjoins the small intestine is known as the pylorus. The pylorus is a funnel-shaped region that connects the stomach to the duodenum, which is the first part of the small intestine. There are two parts to the pylorus: the wider pyloric antrum, which connects to the body of the stomach, and the narrower pyloric canal, which leads into the duodenum. Located at the pyloric canal is the pyloric sphincter, a ring of smooth muscle that controls the emptying of stomach contents into the small intestine.