I’ve heard it explained as a density problem but that doesn’t make sense too me either because then wouldn’t having a smooth brain mean it’s more solid?
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As most have said, a surface area thing, just like the lungs need a lot of surface area. Why? Blood. All the cells in your brain (neurons) need to be near blood to receive oxygen and other exchanges, so they all stay at the surface of the brain, the “interior” is formed only by extension of those cells (axions). So, having the wrinkles on that surface makes possible to have more neurons. Also, it’s believe (i’m not sure if this is a theory or confirmed) that the wrinkles make possible that more neurons are close to each other, and so they can communicate (cell signaling) easier and faster.
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