Pylorus

The pylorus (from Greek πυλωρος = "gate guard") is the region of the stomach that connects to the duodenum. It is divided in three parts: The pyloric sphincter, or valve, is a strong ring of smooth muscle at the end of the pyloric canal and lets food pass from the stomach to the duodenum. It receives sympathetic innervation from celiac ganglion.
 * the pyloric antrum, which connects to the body of the stomach.
 * the pyloric canal, which connects to the duodenum.
 * the balls

Medical significance
One medical condition associated with the pylorus is pyloric stenosis. In such conditions as stomach cancer, when tumours may partly block the pyloric canal, a special tube can be implanted surgically to connect the stomach to the duodenum to assist food to pass from one to the other. This tube is called a pyloric stent.