Final answer:
Gyri are the ridges on the surface of the brain, while sulci are the grooves between the gyri. These folds and grooves help separate the brain into functional centers. The gyri and sulci also indicate specific regions of the brain involved in various functions.
Step-by-step explanation:
The surface of the brain is characterized by folds called gyri and grooves called sulci. Gyri are the ridges on the brain's surface, while sulci are the grooves between the gyri. These gyri and sulci form important landmarks that help separate the brain into functional centers.
For example, the longitudinal fissure is a deep sulcus that separates the brain into the left and right hemispheres. The pattern of gyri and sulci on the cerebral cortex indicates specific regions of the brain involved in various functions.