<P> The stomach is surrounded by parasympathetic (stimulant) and sympathetic (inhibitor) plexuses (networks of blood vessels and nerves in the anterior gastric, posterior, superior and inferior, celiac and myenteric), which regulate both the secretory activity of the stomach and the motor (motion) activity of its muscles . </P> <P> In adult humans, the stomach has a relaxed, near empty volume of about 75 millilitres . Because it is a distensible organ, it normally expands to hold about one litre of food . The stomach of a newborn human baby will only be able to retain about 30 millilitres . </P> <P> In classical anatomy, the human stomach is divided into four sections, beginning at the gastric cardia, each of which has different cells and functions . </P> <Ul> <Li> The cardia is where the contents of the oesophagus empty into the stomach . The cardia is defined as the region following the "z - line" of the gastroesophageal junction, the point at which the epithelium changes from stratified squamous to columnar . Near the cardia is the lower oesophageal sphincter . </Li> <Li> The fundus (from Latin, "bottom") is formed by the upper curvature of the organ . </Li> <Li> The body is the main, central region . </Li> <Li> The pylorus (from Greek, "gatekeeper") is the lower section of the organ that facilitates emptying the contents into the small intestine . </Li> </Ul>

How many compartments does a human stomach have