Initially, a little anatomy. The diaphragm (muscle-tendon septum) separates the chest cavity from the abdominal. Through the esophageal opening of the diaphragm, the esophagus descends into the abdominal cavity and passes into the stomach of the part of the cardiac.
In the place of transition of the esophagus into the stomach, the muscle fibers form a sphincter (bagasse). Normally, outside the swallowing, this sphincter is closed, which prevents the contents of the stomach and gastric juice from entering the esophagus. Continue reading