“It turns out that the huge explosion in the number of brain cells in the brain’s outer layer, called the cortex, forces that layer to swell and then collapse in on itself to form those characteristic creases. This cortical origami—which has also evolved in a handful of other brainy species, such as dolphins and some primates—may be nature’s way of solving the tight packing problem.”
Source: Human Brain’s Bizarre Folding Pattern Re-Created in a Vat – Scientific American
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