ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY. ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY.
Endoscopic image of the human embryo in vivo, after 7 weeks, showing the face in profile. The retina of the eye appears as a dark spot (the cornea has yet to develop), and the basic facial structures are present (though the features are not yet present). 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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