Propels food along the digestive tract, responsible for contractions of GI tract, regulates mobility of GI tract. The muscularis externa of the stomach is modified because other muscularis externa is composed of two layers: the inner circular layer and the outer longitudinal layer. However, the muscularis externa of the stomach contains a third innermost oblique layer. This third innermost oblique layer relates to the function of the stomach because it is the smooth muscle that is responsible for the churning function of the stomach that aids in its ability to digestive and move food from the stomach into the small intestine. The gastroesophageal junction is the junction between the esophagus and the stomach. The epithelium changes from
