Endoscopic image of the human embryo in vivo after 4 weeks, showing the retina of the eye (dark spot)- after another week the lens and cornea will form in front of it. To the left is the developing brain, while the heart (at this stage a simple, curved tube) appears bulging out of the body on the lower left. A paddle- like hand extends at the bottom of the image. 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 (an area where the amniotic wall is thinner).
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