Sulci and Gyri of The Lateral Temporal Lobe

Perhaps the most distinguishing feature of the external cerebral surface is its matter made up in a series of convolutions called "gyri" (singular, "gyrum"), between which are grooves of varying depth called "sulci" (singular, "sulcum") or fissures. The sulci on the lateral surface of the temporal lobe are the lateral cerebral fossa and the lateral sulcus. The margins of this fossa continue to grow, forming the overlapping folds of the "operculum," and the sulcus itself elongates in both directions to separate the temporal lobe from the frontal and the parietal lobes in front and above it. It is divided into three parallel gyri by two sulci. There is no confusion in the names of the gyri; they are simply the "superior," the "middle," and the "inferior temporal gyri." The sulci between the superior and middle temporal gyri is the "superior temporal sulcus," and the sulcus between the middle and the inferior temporal gyri is now called the "inferior temporal sulcus."