This model shows the morphology of the stomach in a moderate distended state with the longitudinal section. This model shows the morphology of the stomach in a moderate distended state. With the longitudinal section, the model shows. The structures of the gastric folds, pyloric valve, pyloric sphincter muscles, gastric mucosa. The transitional mucosa of the gastric esophagus. Made of hard plastic and magnified 2 times the natural size.