Definition: 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.
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Examples: glitazone, GI cocktail, etc.