The esophagus (e-sof-ah-gus) is a hollow tube-like structure that connects the mouth to the stomach. This tube is made up of muscles and membranes and serves as a passageway for food.
There are two sphincters (sfink-ters), which are ring-like muscles at each end of the esophagus. The sphincter at the upper end of the esophagus helps to carry food from the mouth to the stomach. The sphincter at the lower end of the esophagus helps to keep the contents in the stomach from coming back up into the esophagus.
The purpose of the esophageal manometry test is to show how well the esophagus and these sphincters work together.