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- 10:28, 14 March 2010 Z3212774 talk contribs uploaded File:Embryonic Circulations.jpg (category:Heart ILP The three early embryonic circulations. Three paired veins drain into the primordial heart tube: vitelline veins (returning poorly oxygenated blood from the yolk sac), umbilical veins (carrying well-oxygenated blood from the primor)