EDELMANN / SCIENCE PHOTO LIBRARY EDELMANN / SCIENCE PHOTO LIBRARY
Endosopic view of a hand and part of the head of a human embryo at around the 7th week of development. The photograph was taken in vivo through a fibre-optics endoscope introduced into the womb. The embryonic or formative stage of development is considered to be completed by the eighth week. In the subsequent fetal period the accent is on growth rather than on the rapid tissue and organ differentiation that occurred during the embryonic period. Differentiation still occurs, however, up to and after birth - and in some tissues, throughout life.
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