Left Occipital Lobe Convexity. A, Left occipital lobe convexity. In nonatrophic specimens with anatomical variations, it is sometimes difficult to recognize the basic morphology of the superolateral aspect of the occipital lobe. In this hemisphere, a small and less well-defined transverse occipital sulcus is merged with the lunate sulcus, with the superior and middle occipital gyri being separated by this connection. B, Highlighted specimen showing the superior occipital gyrus (green), the inferior occipital gyrus (yellow), and the middle occipital gyrus (blue). (Images courtesy of E de Oliveira)