DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Embryo. Artwork of a seven-week old human embryo. At this stage of development, the embryo is under one inch in length and weighs less that 2 grammes. The main formative stage of development occurs in this embryonic stage, up to 8 weeks from conception. The main bodily structures such as head, limbs and back are developed, as are the major organs. The umbilical cord at lower left supplies the embryo with oxygen and nutrients through the placenta. After 8 weeks and until birth, the unborn child is known as a foetus.
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