The inferior esophageal sphincter, the manometric high pressure zone and hiatal incompetence.
D003680:Deglutition Disorders / Q000000981:diagnostic imaging* / Q000503:physiopathology; D004931:Esophageal Achalasia / Q000000981:diagnostic imaging* / Q000503:physiopathology; D004943:Esophagogastric Junction / Q000000981:diagnostic imaging*; D005764:Gastroesophageal Reflux / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006548:Hernia, Diaphragmatic / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D011312:Pressure; D011859:Radiography