Abstract: A study of the esophago-gastric junctional area was carried out in 5 specimens of golden monkey of our country. The border of the mucous membrane between the esophagus and the stomach is very clear. This border is located in the cardiac orifice. The esophageal mucous membrane is thick and contains a few of the mucosal glands which are limited in the narrow zone near cardiac end of the esophagus, but the submucosal glands are not found in this area. The esophageal mucosal epithelium is typical stratified squamous and is characterized by the keratinization. The muscularis mucosae is broad, whereas the lamina propria, relatively thin. The muscularis is composed of two primary layers-an inner circular and outer longitudinal layer. Some of striated muscle bundles are intermingled in the longitudinal layer. The orifice between the esophagus and the stomach in boundedly band of circular muscles which are much thicker than that any elsewhere. The cardiac glands are short branched tubular ones. The cells of the cardiac glands are mucous. The mucous cell granules stain intensely, with periodic acid-Schff (PAS). Histologically there is an abrupt transition from squamous esophageal epithelium to columnar gastric epithelium at the esophagogastric junction.

Key words: Rhinopithecus; Esophago-gastric junction; Histological structure