Did you know that the folds in the brain are a result of fitting more brain in the skull and if unfolded the human brain would be the size of a pillowcase.
When you think about how your brain looks, you probably picture a roundish, two-lobed gray mass covered in “wrinkles.” As humans evolved as a species, our brains grew larger to accommodate all of the higher functions that set us apart from other animals. But in order to keep the brain compact enough to fit into a skull that would actually be in proportion with the rest of our body size, the brain folded in on itself as it grew. If we unfolded all of those ridges and crevices, the brain would be the size of a pillowcase. The ridges are called gyri and the crevices are called sulci. Several of these ridges and crevices even have names, and there are variations in exactly how they look from person to person.
The folds in the brain are a result of fitting more brain in the skull and if unfolded the human brain would be the size of a pillowcase.
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