[TA] the posterior, somewhat pyramid-shaped part of each cerebral hemisphere, demarcated by no distinct surface markings on the lateral convexity of the hemisphere from the parietal and temporal lobes, but sharply delineated from the parietal lobe by the parietooccipital sulcus on the medial surface. SYN: lobus occipitalis [TA], occipital lobe [TA].
