The stomach is an important organ and the most dilated portion of the digestive system. The esophagus precedes it, and the small intestine follows. It is a large, muscular, and hollow organ allowing for a capacity to hold food. It is comprised of 4 main regions, the cardia, fundus, body, and pylorus. The cardia is connected to the esophagus and is where the food first enters the stomach. The fundus follows the cardia and is a bulbous, dome-shaped, superior portion of the stomach.