vessel drains blood from yolk sac vein vitelline blood vessel vitelline vein XAO:0004147 VHOG:0000401 SCTID:308832003 The paired veins that carry blood from the yolk sac back to the embryo. vascular vitelline network omphalomesenteric vein UBERON:0005487 NCIT:C34329 RETIRED_EHDAA2:0002209 vitelline veins XAO:0000376 SCTID:2730004 embryonic vitelline vein EMAPA:36021 vein of omphalomesenteric system vena vitellina Wikipedia:Vitelline_veins FMA:70305 systemic vein