On the right, note the ora serrata or Z line, the injunction of the esophageal squamous mucosa and the gastric columnar mucosa. The border is usually serrated as seen here. The cardial tissue is snug around the endoscope and the fundus is partially seen on the right. Normal cardia is seen with the endoscope retroflexed. The cardial tissue is snug around the endoscopic examination.
Normal antrum is visualized proximal to the pylorus.
Normal anatomy of the duodenum is demonstrated. Note that the mucosa of the bulb is free of folds and that some bile is present. On the right is a close up view. Note the characteristic red, reticulated surface. Two longitudinal folds distal to the papilla can be appreciated.