EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
The human foetus after 20 weeks showing the degree of development of the hands and fingers (the nail beds are laid down): to the left is the face with the nose & mouth visible. Both the upper & lower limbs display active movement at this time. The maturation of the nervous & muscular systems enables the foetus to perform simple reflex actions; it begins to suck in amniotic fluid into its stomach. In addition, the fingers close if the palm of the hand is touched.
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