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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.

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pylorus (pi-lor´әs) the lower part of the stomach, where it connects to the duodenum. A ring of muscles, the pyloric sphincter, serves as a “gate,” to close the opening; it opens periodically to allow the contents of the stomach to move into the duodenum. Numerous glands in this region produce hydrochloric acid.
the term has also been used to mean just part of the pyloric part of the stomach, such as the pyloric antrum or the pyloric opening.

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