ventral mesogastrium

ven·tral mes·o·gas·tri·um

the primitive midline mesentery extending between future stomach and proximal duodenum and the anterior abdominal wall superior to the umbilicus (umbilical vein). The liver develops within it; consequently, the lesser omentum, coronary and falciform ligaments are derivatives of it. The umbilical vein runs in its caudal free edge, becoming the postnatal round ligament of the liver.