The parietooccipital sulcus is a deep groove on the medial surface of each hemisphere that marks the boundary between the parietal lobe in front and the occipital lobe behind. It runs downwards and forwards to join the calcarine sulcus, and only a small notch of it reaches the lateral surface. The cuneus lies in the angle between the two sulci.
| Location | Medial surface of the hemisphere, from the superior margin downwards and forwards to the calcarine sulcus |
|---|---|
| Connections | |
| Blood Supply | Posterior cerebral artery (parieto-occipital branch) |
Marks the boundary between the parietal and occipital lobes on the medial surface.
It is a key landmark for identifying the occipital lobe and the precuneus on MRI. Lesions near the sulcus may involve the dorsal visual stream, affecting reaching and spatial vision. The parieto-occipital artery, a branch of the posterior cerebral artery, runs within it.
Stroke in posterior cerebral artery branches affecting the cuneus and precuneus, causing visual and spatial problems.
Degeneration of the parietal and occipital cortex around this sulcus, causing early visual and spatial problems.
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