[Omphalo- + mesenteric.] (Anat.) Of or pertaining to the umbilicus and mesentery; omphalomesaraic; as, the omphalomesenteric arteries and veins of a fetus.
o. duct — the duct which connects the yolk sac with the embryonal alimentary tract in vertebrates.
o. vessels — arteries and veins carrying blood between the embryonal circulation and the yolk sac; destined to contribute to the blood supply to the gut and the portal venous drainage.
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