The cuneus is a wedge-shaped area on the medial surface of the occipital lobe, lying between the parieto-occipital sulcus above and the calcarine sulcus below. Its lower edge forms the upper bank of the primary visual cortex. It processes the lower half of the opposite visual field.
| Location | Medial occipital lobe, between the parieto-occipital and calcarine sulci |
|---|---|
| Parts | |
| Connections |
|
| Blood Supply | Posterior cerebral artery (calcarine and parieto-occipital branches) |
Processes the lower half of the opposite visual field and passes information to areas that judge position and movement.
Damage to the cuneus causes a lower quadrant visual field defect on the opposite side (inferior quadrantanopia). Because it is supplied by branches of the posterior cerebral artery, it is often involved in posterior circulation strokes. Lesions above the calcarine sulcus may also involve parietal visual pathways, affecting visually guided reaching.
Loss of the lower quarter of the opposite visual field from damage to the cuneus or upper optic radiation.
Posterior cerebral artery stroke affecting the cuneus and nearby visual cortex.
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