ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY. ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY.
Endoscopic image of the human foetus in vivo, after 9 weeks, showing both hands held in front of the face: the nail beds of the fingers, the bone- forming cartilage of the hand, and the blood vessels of the hand (visible through translucent skin) are all evident. The endoscope, a series of lenses and a fibre-optic light guide, is inserted through the cervix (the neck of the womb) and manipulated until a "window" into the amniotic sac is found (ie an area where the wall is thinner).
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