The anatomy of the stomach describes the structure of this essential organ of the digestive system. First, the stomach is a muscular organ shaped like a sac, located in the upper part of the abdomen between the esophagus and the small intestine. In addition, its main function is to store and digest food.
The stomach is divided into several anatomical regions. First is the cardiac region or cardia, which is the area where the esophagus connects to the stomach. This region allows food to pass into the stomach.
Next is the fundus of the stomach, which is the upper portion of the organ. Moreover, this region can temporarily store food and gases produced during digestion.
After that comes the body of the stomach, which forms the largest part of the organ. In this region, most of the chemical digestion occurs due to the secretion of gastric acid and digestive enzymes.
Finally, the stomach ends in the pylorus, a region that connects the stomach with the duodenum, the first part of the small intestine. The pyloric sphincter regulates the passage of digestive contents into the intestine.
During digestion, the stomach mixes food with gastric juices through muscular movements. As a result, food is transformed into a semi-liquid substance called chyme.
Afterward, chyme gradually moves into the small intestine, where digestion and nutrient absorption continue.
In addition, the stomach produces mucus, which protects the stomach lining from the effects of gastric acid.
In conclusion, the anatomy of the stomach —including the cardia, fundus, body, and pylorus— allows food to be stored, mixed, and digested before it passes into the intestine.