What term describes the grooves between the gyri on the brain surface?

What term describes the grooves between the gyri on the brain surface?

• A. Gyri
• B. Fissures
• C. Sulci
• D. Lobes

Answer: (C)

Sulci are the grooves between the ridges (gyri) on the brain’s surface. They form part of the wrinkled cortex that increases surface area for neural processing. Fissures are deeper grooves that separate major brain regions, such as the longitudinal fissure between hemispheres or the lateral (Sylvian) fissure that helps separate frontal/temporal from parietal areas. Gyri are the raised ridges themselves, and lobes are the large brain divisions. For example, the central sulcus lies between the precentral gyrus and postcentral gyrus.

Sulci are the grooves between the ridges (gyri) on the brain’s surface. They form part of the wrinkled cortex that increases surface area for neural processing. Fissures are deeper grooves that separate major brain regions, such as the longitudinal fissure between hemispheres or the lateral (Sylvian) fissure that helps separate frontal/temporal from parietal areas. Gyri are the raised ridges themselves, and lobes are the large brain divisions. For example, the central sulcus lies between the precentral gyrus and postcentral gyrus.