The occipital lobe is the smallest of the four lobes of the cerebral hemisphere. It is present posterior to the parietal and temporal lobes, and thus it forms the caudal part of the brain. The paired occipital lobes are separated from each other by a cerebral fissure. The occipital lobe is primarily responsible for visual processing. It contains the primary and association visual cortex. The cerebral surface of the occipital lobe irregularly molds into eminences called gyri and is separated by depressions called sulci: the intra occipital sulcus, the transverse occipital sulcus, and the lateral occipital sulcus. The medial surface of the occipital lobe has a characteristic calcarine sulcus or calcarine fissure. It extends from the parieto-occipital sulcus to the occipital pole.