FROM
Huffpost Science
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The reason our brains have that wrinkly, walnut shape may be that the rapid growth of the brain’s outer brain — the gray matter — is constrained by the white matter, a new study shows.
Researchers found that the particular pattern of the ridges and crevices of the brain’s convoluted surface, which are called gyri and sulci, depends on two simple geometric parameters: the gray matter’s growth rate and its thickness. The development of the brain’s wrinkles can be mimicked in a lab using a double-layer gel, according to the study published today (Aug. 18) in the journal Proceedings of the National Academy of Sciences.
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The human brain is relatively large and very wrinkled. Wrinkles increase the surface are for neurons.
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James' World 2 
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