The stomach is the digestive organ of human body, located under the diaphragm, connected with esophagus and small intestine. The upper mouth of the stomach is cardia, and the lower mouth is pylorus. The stomach is also called the epigastric cavity, so the esophagus is above the stomach, the intestine is below the stomach, and the stomach between them is called epigastric cavity. It is divided into three parts: upper, middle and lower. The upper part of the stomach is called epigastrium, including cardia; The middle part of the stomach is called zhongwan, which is the body of the stomach; The lower part of the stomach is called inferior epigastric gland, including pylorus.
Extended data
Viscera is the general name of most organs located in body cavity but directly or indirectly communicating with the outside world, including digestive system, respiratory system, urinary system and reproductive system. According to its morphological structure, it can be divided into lumen organs and parenchymal organs. The lumen organs are connected with the outside world through pipelines; The parenchymal organs are mainly glands, and there are catheter openings on the wall of the lumen organs.
From the perspective of individual development, most digestive and respiratory systems are derived from endoderm; The respiratory organ is another tube protruding from the upper part of the primitive digestive tube to the ventral side. The urinary and reproductive organs originated from the urogenital ridge of mesoderm and evolved into urinary and reproductive systems with different functions. But men still have common discharge tubes. Therefore, some people collectively refer to the urinary and reproductive systems as the urogenital system.