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Blood flow into the sinus venosus is from three pairs of vessels: the cardinal veins that drain the embryo proper, the vitelline veins from the yolk sac, and the umbilical veins from the placenta.
 
                     Species: Mouse 
                     Day Gestation: 9 
             Approx. Human Age: 25 days 
                                   View: Frontal
 
               Week 4 Development
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