The initial portion of the pyloric part of the stomach: The pyloric antrum may temporarily become partially or completely shut off from the remainder of the stomach during digestion.

The dilated natural cavity or hollow of the pyloric part of the stomach, is between the body of the pyloric antrum (antrum pyloricum) stomach and the pyloric canal.

The pyloric antrum is the bulging part of the lower end of the stomach between the body of the stomach and the pyloric canal which is near the bottom of the stomach which separates the stomach and the duodenum (small intestine).