The pylorus ( or ), or pyloric part, connects the stomach to the duodenum. The pyloric glands are located in the antrum of the pylorus. Pyloric stenosis refers to a pylorus that is narrow. This type consists of a transversely closed longitudinal incision across the pylorus. This is distinct from the mucosa of the pylorus, which directly joins to the duodenum. Subsequently, the duodenum is transected respecting the pylorus. Near the pylorus lie "pyloric glands" and are located in the antrum of the pylorus. The "pyloric antrum" is the initial portion of the pylorus. Glands differ where the stomach meets the oesophagus, and near the pylorus. Gastric adenocarcinoma, especially at the pylorus, is the most common source. It is thin at the cardiac extremity, but thicker toward the pylorus. Unstriated muscles which are entirely involuntary are located at the Pylorus. The pylorus is one component of the gastrointestinal system. The neck lies mostly behind the pylorus of the stomach, and is covered with peritoneum. The lumen of the pylorus is narrower, and less food is able to pass through.