The plural of gyrus; the rounded ridges on the surface of the brain that increase its surface area for processing information.
From Latin gyrus meaning 'circle' or 'turn,' derived from Greek gyros. The term entered medical and anatomical vocabulary in the 17th century to describe the visible convolutions of the cerebral cortex.
Your brain's wrinkly appearance isn't random—those gyri and their valleys (sulci) triple your brain's surface area compared to a smooth sphere, packing more processing power into your skull. Evolution literally folded our thinking organs to make us smarter!
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