GASTROSCOPY, ILUSTRATION,Representation of the gastroscopy, highlighting the path and the localization of the gastrofibroscope introduced by the mouth, descending into the esophagus, the stomach up to the duodenum. Two areas representing the two delicate places by which the gastrofibroscope passes, that are the pharynx and the gastroesophageal sphincter. On the right of the drawing, representation of the gastrofibroscope enabling to explore the upper part of the digestive tube, extract small tumors, stop hemorrhages, by injection or coagulation.