The stomach first appears as a fusiform dilatation of the caudal part of the foregut in the middle of the 4th week. It soon enlarges and broadens ventrodorsally, so that now it becomes a flattened, sac-like structure having right and left walls and an anterior and a posterior border. This primitive stomach lies in the median plane and is located very high in the cervical region of the embryo. The stomach primordium is attached to the dorsal wall of the abdominal cavity by a dorsal mesentery called dorsal mesogastrium. A ventral mesentery, known as ventral mesogastrium, develops later from the septum transversum and attaches the stomach to the liver and ventral abdominal wall.