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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.
Esophageal manometry measures the different factors that play a role in the motility and function of the upper esophageal sphincter, the body of the esophagus, and the lower esophageal sphincter.egarding the esophageal body, manometry has shown that bolus transit through the esophageal body does not occur in a single smooth wave, but rather represents a sequence of contractions that occur within 4 pressure segments extending from the upper esophageal sphincter to the lower esophageal sphincter.