<Tr> <Td_colspan="2"> Human embryo . Brain and heart represented from right side . Digestive tube and yolk sac in median section . (Umbilical vein labeled at bottom left .) </Td> </Tr> <Tr> <Th_colspan="2"> Details </Th> </Tr> <Tr> <Th> Drains to </Th> <Td> Inferior vena cava </Td> </Tr> <Tr> <Th> Artery </Th> <Td> umbilical artery </Td> </Tr>

Where does the umbilical vein lead to in a pig