Sulci and Gyri of The Occipital 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 occipital lobe has a considerable variability with respect to the sulcal and gyral pattern on its convex surface. The most frequently observed sulci include the "transverse occipital sulcus," the "lateral occipital sulcus," and the "lunate sulcus." The convolutions are also quite variable, but usually divide much of the occipital lobe into the "superior" and "inferior lateral occipital gyri". The "parieto-occipital sulcus" which helps to form the border between the parietal and occipital lobes is the "parieto-occipital arcus." The middle surface of the occipital lobe is marked by the "calcarine" and the "parieto-occipital sulci," which form the boundaries of the wedge-shaped lobule called the "cuneus."