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Unlike gray matter, the brain's white matter—wire-like fibers that establish neurons' long-distance connections between brain regions—thickens progressively from birth in humans. A layer of insulation called myelin progressively envelops these nerve fibers, making them more efficient, just like insulation on electric wires improves their conductivity.


Source:
Teenage Brain: a work in progress (NIH)
or go to NIH and search for "Teenage Brain: a work in progress"






-- CatherineJohnson - 23 May 2006

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