Brain gyri and sulci serve two very important functions: They increase the surface area of the cerebral cortex and they form brain divisions. Increasing the surface area of the brain allows more neurons to be packed into the cortex so that it can process more information.

Why does our brain have crevices?

The human brain is relatively large and very wrinkled. Wrinkles increase the surface are for neurons. ... 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.

Why gyri of brain is more and folded?

These countless folds allow humans to pack in more neurons which, in turn, can mean more advanced brains with increased cognitive abilities, Ronan said. ... Though the brains' ridges and valleys — called gyri and sulci, respectively — look random, they're actually consistent across individuals, and even some species.