1. Plural of gyrus; the rounded ridges on the surface of the brain.
Usage: anatomy; medical

Examples

• The gyri and sulci of the cerebral cortex increase the brain's surface area.
• Neuroscientists study the patterns of gyri to understand brain structure.
• The precentral gyri contain the motor cortex.
• Brain imaging revealed unusual spacing between the gyri in the patient's scan.
• The gyri are separated by deep grooves called sulci.