Brodmann (1909) area 40

area 40 of Brodmann

Brodmann area 40, or BA40, is part of the parietal cortex in the human brain. The inferior part of BA40 is in the area of the supramarginal gyrus, which lies at the posterior end of the lateral fissure, in the inferior lateral part of the parietal lobe. It is bounded approximately by the intraparietal sulcus, the inferior postcentral sulcus, the posterior subcentral sulcus and the lateral sulcus. Cytoarchitecturally it is bounded caudally by the angular area 39 (H), rostrally and dorsally by the caudal postcentral area 2, and ventrally by the subcentral area 43 and the superior temporal area 22 (Brodmann-1909). Cytoarchitectonically defined subregions of rostral BA40/the supramarginal gyrus are PF, PFcm, PFm, PFop, and PFt. Area PF is the homologue to macaque area PF, part of the mirror neuron system, and active in humans during imitation. The supramarginal gyrus part of Brodmann area 40 is the region in the inferior parietal lobe that is involved in reading both in regards to meaning and phonology. [WP,unvetted].

Type Organ
Latin Name area 40 of Brodmann
FMA ID 68637

Frequently Asked Questions

What is Brodmann area 40?
Brodmann area 40 (BA40) is a region of the cerebral cortex located in the inferior parietal lobule, corresponding to the supramarginal gyrus. It is defined by its cytoarchitecture and is involved in language processing and spatial cognition.
Where is Brodmann area 40 located?
BA40 is located in the inferior parietal cortex, forming the supramarginal gyrus at the posterior end of the lateral (Sylvian) fissure. It is bounded superiorly by the intraparietal sulcus and inferiorly by the lateral sulcus.
What functions are associated with Brodmann area 40?
BA40 is involved in phonological processing, language comprehension, spatial attention, and tool use. It is part of Wernicke's area (along with BA22) in the dominant hemisphere and contributes to reading and the phonological loop of working memory.
What happens when Brodmann area 40 is damaged?
Damage to BA40 in the dominant (usually left) hemisphere can result in conduction aphasia (poor repetition despite relatively preserved comprehension and expression), ideomotor apraxia (inability to perform learned gestures), and phonological processing deficits.
How does BA40 differ from adjacent BA39?
BA40 (supramarginal gyrus) is anterior to BA39 (angular gyrus). While both are involved in language, BA39 is more associated with semantic processing and reading comprehension, whereas BA40 is more involved in phonological processing and sensorimotor integration.

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Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.