The stomach is located in the upper part of the body’s abdominal cavity – the upper abdomen (commonly known as the “heart fossa”) – and slightly to the left, and is the largest part of the digestive organs in terms of internal cavity, which resembles a gourd with two open ends. It resembles a gourd with two open ends. At its upper end is the cardia, which connects to the esophagus and receives food swallowed from the mouth, and at its lower end is the pylorus, which connects to the duodenum. The stomach is divided into three parts, starting from the upper end, below the cardia, in order to be called the fundus (dome), the body of the stomach, the gastric sinus, according to its shape, also known as the gastric less curved side, gastric greater curved side, the junction between the body of the stomach and the sinus is called the gastric angle. The duodenum is about 30 cm long, with a circular bend, connected to the pylorus and down to the jejunum. The part of the duodenum connected to the stomach swells to form a triangle-like part called the “duodenal bulb”, and most duodenal ulcers occur in this area. The opening of the bile duct and pancreatic duct is in the wall of the duodenum, called the “duodenal papilla”, through which bile and pancreatic juices flow to the duodenum and small intestine.