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In neuroanatomy, a gyrus (pl. gyri) is a ridge on the cerebral cortex. It is generally surrounded by one or more sulci (depressions or furrows; sg. sulcus). Gyri and sulci create the folded appearance of the brain in humans and other mammals.
These series of convolutions called gyri (singular, gyrus) are perhaps the most distinguishing feature of the external cerebral surface. Between them are grooves of varying depth called sulci (singular, sulcum) or fissures. The frontal lobe is crossed over by three sulci, which divide the frontal lobe into four gyri. The three sulci are the precentral, superior frontal, and inferior frontal sulci and the four gyri are ... Click to read more below. The inferior frontal gyrus is one of four such gyri in the frontal lobe.