which is deeper groove: sulcus or a fissure
*Gyrus (gyri)-is a ridge on the cerebral cortex. Folds on the brain material. Many ridges called convolutions, or gyri, or gyrus, separated by grooves, mark the cerebrum 's surface. *Sulcus (sulci)- shallow grooves on the brain.Generally, a shallow to somewhat deep groove is called a sulcus, or sulci, and a very deep groove is called a fissure.Posted by Saketh Raghavan (student) on 15/3/13.Gyrus (gyri)-is a ridge on the cerebral cortex. Folds on the brain material. Many ridges called convolutions, or gyri, or gyrus, separated by grooves, mark the cerebrum 's surface. *Sulcus (sulci)- shallow grooves on the brain.