It has to receive swallowed liquids and solids, accomodate and prepare them for as long as necessary, and deliver them into the duodenum. It appears that it may play an important role, not only in gastric emptying of solids and liquids, but also in various aspects of gastro-duodenal motility. The pyloric sphincteric cylinder is the same muscular structure as the canalis egestorius and the fan-shaped muscle. It is suggested that the terms right and left pyloric loops be used for right and left canalis loops respectively. For muscle torus the term muscle knot is preferred as the two loops meet in that situation.
Pyloric aperture is the opening surrounded by the lips of the pyloric ring.
Its diameter varies, depending mainly on the degree of contraction and relaxation of the cylinder. The living stomach and its motor phenomenon. The varying form of the stomach in man and the anthropoid ape. Pyloric musculature with special reference to pyloric block. The anatomy and movements of the pyloric sphincteric cylinder.