The gastroesophageal sphincter.
D001341:Autonomic Nervous System / Q000033:anatomy & histology; D003679:Deglutition / Q000502:physiology; D003964:Diaphragm / Q000502:physiology; D004931:Esophageal Achalasia / Q000209:etiology; D004943:Esophagogastric Junction / Q000033:anatomy & histology / Q000294:innervation / Q000502:physiology* / Q000503:physiopathology; D005764:Gastroesophageal Reflux / Q000209:etiology; D006548:Hernia, Diaphragmatic / Q000503:physiopathology; D006801:Humans