Contributions to The Study of the Esophagus and Stomach Morphology in Laboratory Mouse

Abstract. Aim of the study is to illuminate some data on gastric esophageal junction morphology in laboratory mouse brings explanations on mice unable to vomit.There are few literature data on the conformation and structure of the laboratory mouse esophagus and stomach. They try to explain why the mouse can not vomit. Deviating slightly to the left only in the cervical region the esophagus runs mainly in the cervicalregion the esophagus runs mainly midsagittally along the dorsal aspect of the trachea. Its length is abaut 30 mm( 3, 4). Throughaut its length the diameter is abaut 2 mm. Throughaut its length the diameter is abaut 2 mm. The epithelium of the esophagus is moderately to extensively cornifield. The submucosa is free of gland. Both layers of the muscular coat are made budles of skeletal muscle. The esophagus enters the middle of the lasser curvature. The esophageal sphincter is a circular muscle that surrounds the base of the esophagus. At its lower edge, it has muscle fibers that insert into the limiting ridge. So when the sphincter contracts, it not only constricts the walls of the esophagus, it also pulls the sides of the limiting ridge's U together, thus hiding and tightly closing the esophageal opening. Muscle layer is formed on the entire length of skeletal muscle fibe