RICK HALL / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY RICK HALL / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Human foetus. Illustration of a human foetus at 7- 8 weeks old, known as a first trimester embryo under the age of 12 weeks. The eye and limbs are visible. The embryo is attached to the placenta and the mother's blood circulation by an umbilical cord, and it floats in an amniotic sac filled with amniotic fluid. During the first trimester the embryo develops a distinct human appearance; by the end of 8 weeks the embryo is called a foetus. In this early period, organ differentiation over- shadows growth. In the subsequent foetal period, from the 3rd lunar month to birth, the emphasis is on growth rather than differentiation.
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