Parietal Lobe

The parietal lobe is separated anteriorly from the frontal lobe by the central sulcus, laterally from the temporal lobe by the sylvian fissure and posteriorly from the occipital lobe by the parieto-occipital sulcus (an imaginary line extending from the pre-occipital notch of the temporal lobe superiorly to the parieto-occipital sulcus) (Fig. 9.1). The postcentral sulcus runs downwards and forwards a little behind and parallel to the central sulcus. The area between these two sulci is called the postcentral gyrus. The rest of the parietal lobe is divided into a superior and inferior parietal lobule by an intraparietal sulcus which runs horizontally backwards from the postcentral sulcus.