06/29/2011 02:32 pm ET Updated Aug 29, 2011

PHOTOS: 100-Year-Old Drawings of the Human Brain

With an artist's eye 
and a scientist's mind, 
anatomist Santiago 
Ramón y Cajal was the 
first to see -- and illustrate 
-- what neurons really do. 
His exquisitely detailed 
drawings changed our 
understanding of the brain 
and nervous system.

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