EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
The head of a human embryo at about 7 weeks, showing the retina of the eye (a development of optic vesicles which appear on the side of the head at about 4 weeks), & the developing cranial bones. The brain is undergoing radical divisions: the void at the base of the head has yet to be filled by further growth; another fold reduces it to a small cavity - the 4th ventricle (found under the cerebellum).
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