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The supramarginal gyrus (plural: supramarginal gyri) is a portion of the parietal lobe of the brain. It is one of the two parts of the inferior parietal lobule, the other being the angular gyrus. It plays a role in phonological processing (i.e. of spoken and written language) and emotional responses.
The supramarginal gyrus is horseshoe-shaped and caps the posterior ascending ramus of the lateral sulcus, lying just anterior to the angular gyrus. Anteriorly it merges with the inferior aspect of the postcentral gyrus.
The main blood supply is via the middle cerebral artery (MCA).
Damage to the right-sided supramarginal gyrus may result in emotional egocentricity bias.
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