The supramarginal gyrus forms the front part of the inferior parietal lobule, curving around the upturned posterior end of the lateral sulcus. It corresponds roughly to Brodmann area 40. It sits next to the postcentral gyrus in front and the angular gyrus behind.
| Location | Inferior parietal lobule, around the posterior end of the lateral sulcus |
|---|---|
| Parts |
|
| Connections | |
| Blood Supply | Middle cerebral artery (posterior parietal branches) |
Supports phonological processing and verbal working memory, planning of skilled actions, and integration of body sensation.
Dominant supramarginal damage is linked to conduction aphasia, in which repetition is poor despite fairly good comprehension, and to ideomotor apraxia, difficulty performing learned gestures on command. It also contributes to phonological working memory, so lesions impair holding sounds in mind.
Poor repetition with relatively preserved fluency and comprehension, from damage to the supramarginal gyrus or arcuate fasciculus.
Difficulty performing learned skilled movements or gestures on command, despite normal strength.
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