結構進化

Folds in the cerebral cortex in mammals are believed to be indispensable (不可或缺的) for higher brain functions but the mechanisms underlying cortical folding remain unknown.

The fold (protrusion) of the cerebral cortex surface. The gyrus (腦回) is thought to have been developed in the process of evolution. The gyrus allows accommodation of a large number of neurons in the cerebral cortex, which has had much to do with development of higher brain functions.

https://www.sciencedaily.com/