Which of the following mechanism CANNOT prevent gastroesophageal reflux?
All the factors except circular fibres of GE sphincters have been mentioned in the mechanisms which help in the prevention of gastroesophageal disease. So Circular muscle fibres of GE sphincter is answer of choice here. Ref: Sabiston 18/e, Page 1108; Essential of Surgery By Sunil Chumber 1/e, Page 750; Textbook of Surgery By S. Das 3/e, Page 790; Bailey & Love 22/e, Page 650.
Looping fibres of right crus of diaphragm
Mucosal folds at gastroesophageal junction
Circular muscle fibres of GE sphincter
Angle made by the esophagus with stomach