EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
The human foetus during the 5th month of development, showing the hands, which display active movement at this time. Maturation of the nervous system, coupled with an increase in muscular co-ordination, enables the foetus to suck its thumb. The reflex of grasping is also being developed, with the fingers being closed if the palm is touched.
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