Schindler (1936) described the interior of the stomach as seen at gastroscopy in patients lying on their left side. In this position the pyloric part falls to the left and forward towards the anterior abdominal wall. While radiologists perceive the incisura angularis as an indentation of the lesser curvature side of the barium column, gastroscopists see it as a prominence or “kind of fold” in the inside of the stomach, called the angulus or angle. According to Schindler the stomach could be divided into two parts: the part above the angulus or pars digestoria, and the part between the angulus and pylorus or pars egestoria. If little air is used for inflation at gastroscopy, another prominent fold, the musculus sphincter antri, becomes visible on the anterior and posterior walls and greater curvature at the level of the angulus. It is a separate entity from the angulus, is probably formed by contraction of the muscularis externa and is usually not demonstrable radiologically.