Anatomical investigations of the muscular layer of the cardia in corpses of adults (30-70 years of age) have shown the presence in the cardia of a 25-35 mm long sphincter disposed at an angle to the horizontal plane. Its formation proceeds with the participation of both the esophageal musculature (circular layer) and gastric musculature (gastro-esophageal fibers of the oblique muscular layer). As a whole, myo-architectonics of the cardia is dependent on the character of interrelation of the muscular layers of the esophagus and stomach which is responsible for the opening and closure of the gastro-esophageal junction.
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