Parietooccipital sulcus

On the medial surface of the brain, there is a significant sulcus called the parietooccipital sulcus. While it is primarily visible on the medial surface, it also curves over the upper edge of the cerebral hemisphere extending to the lateral surface. This creates a small indentation on the superolateral surface, approximately 5 cm in front of the occipital pole.

On the medial surface of the cerebral hemisphere, the parietooccipital sulcus descends and moves forward as a deep cleft. It merges with the calcarine fissure, below and behind the posterior end of the corpus callosum. The sulcus separates the occipital lobe’s cuneus area at the back from the pre-cuneus region of the parietal lobe in the front.

On the superolateral surface of the brain, there is an imaginary line connecting the indentation of the parietooccipital sulcus and the pre-occipital notch of the inferior border, creates a hypothetical line. The area behind this line encompasses the occipital lobe.