ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY. ALEXANDER TSIARAS / SCIENCE PHOTO LIBRARY.
Endoscopic image of the human foetus in vivo after 15 weeks, showing the external ear almost fully formed. The endoscope, a series of lenses and a fibre-optic light source, is inserted through the cervix and manipulated until a "window" into the amniotic sac is found (ie an area where the wall is thinner).
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