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Definition. The esophagus is the swallowing tube through which food passes on its way from the mouth to the stomach. The main function of this organ is to propel food down into the stomach. There is also a mechanism to prevent food from coming back up or refluxing from the stomach into the esophagus.Esophageal function tests are used to determine if these processes are normal or abnormal.he main function of this organ is to propel food down into the stomach. There is also a mechanism to prevent food from coming back up or refluxing from the stomach into the esophagus. Esophageal function tests are used to determine if these processes are normal or abnormal.
Just before the esophagus gets to the stomach, it travels through your diaphragm. The diaphragm is a broad muscle that separates your stomach from your chest cavity. The opening in the diaphragm where the esophagus travels through, is called the hiatus.. You'll hear more about the hiatus, and how it can be associated with GERD, a little later. The esophagus then joins the stomach at the lower esophageal sphincter, also called the LES..