DR M.A. ANSARY / SCIENCE PHOTO LIBRARY DR M.A. ANSARY / SCIENCE PHOTO LIBRARY
A human fetus after eight weeks development, surrounded by an intact, fluid-filled amniotic sac. The amniotic sac is bound by two membranes, the inner amnion & outer chorion. The umbilical cord, the link betweeen the fetal and maternal blood circulations, is prominent to the left. The end of the eighth week marks the point at which an embryo becomes known as a fetus.
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