The placenta + the fetal membranes that are norm ally expelled
from the uterus after the birth of the baby. Hence, the "afterbirth." The placenta
is of course the organ that joins the mother and fetus and permits the provision
of oxygen and nutrients to the fetus and the release of carbon dioxide and waste
products from the fetus to the mother. As humanity only disposable organ, the placenta
is disk-shaped and at full term measures about 7 inches (18 cm) in diameter and
a bit less than 2 inches (4 cm) thick. The fetal membranes-the chorion is the outer
one and the amnion is the inner one - envelop the embryo and contain the amniotic
fluid. The word "afterbirth" entered the English language in the 16th
century. The term has also been applied to a child born after the father's death
or last testament.
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