In the fetus, the ductus venosus connects the left umbilical vein with the upper inferior vena cava. This allows deoxygenated blood from the fetus to return to the placenta without placing a load on the fetus' kidneys or liver. Fetus at eight weeks A fetus (alternatively foetus or fÅtus) is an unborn human offspring from the end of the 8th week of pregnancy (when the major structures have formed) until birth. ... An umbilicus which appears as a depression in the abdomen is referred to as an innie. The umbilicus (commonly called a navel, or belly or tummy button), is essentially a scar caused at birth by the removal of the umbilical cord from a newborn baby. ... The superior and inferior venae cavae are the veins that return the blood from the body into the heart. ... Human placenta shown a few minutes after birth. ...
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