The bilateral Left Cerebrum.Frontal Lobe.Middle Frontal Gyrus.Gray Matter.Brodmann area 9 corresponds to a portion of the dorsolateral prefrontal cortex involved in higher-order cognitive control, including working memory, planning, abstract reasoning, and aspects of executive function and decision-making. Cytoarchitectonically defined by its granular frontal cortex, Brodmann area 9 integrates multimodal information and contributes to the regulation of attention, monitoring of behavioral outcomes, and modulation of emotional responses via connections with other prefrontal, parietal, and limbic regions. Functionally, this region participates in complex cognition such as rule-based behavior and moral or social judgment, and is frequently implicated in neuroimaging studies of reasoning, cognitive flexibility, and top-down control of behavior. There is no direct link for “Brodmann area 9,” but it is part of the Dorsolateral prefrontal cortex.
The bilateral left middle frontal gyrus (Brodmann area 9) has been repeatedly implicated in genetic studies of higher-order cognition, psychiatric risk, and brain morphology, although most findings are at the level of regional volume, cortical thickness, or activation rather than Talairach-specific labels. Large-scale GWAS of cortical structure (e.g., ENIGMA and UK Biobank) have identified common variants near genes such as CENPW, DACT1, KIAA0586, and others associated with frontal cortical thickness and surface area, which encompass BA9-related parcels in standard neuroanatomical parcellations. Polygenic risk scores for schizophrenia, bipolar disorder, and major depressive disorder are associated with altered gray matter volume and functional activity in BA9, and risk loci in genes including CACNA1C, ZNF804A, and GRM3 have been linked, via imaging genetics, to prefrontal (including BA9) activation abnormalities during working memory and cognitive control tasks. Similarly, APOE and other Alzheimer’s disease–related variants show associations with accelerated atrophy or hypometabolism in dorsolateral prefrontal regions that overlap BA9. GWAS of cognitive traits (general intelligence, executive function, educational attainment) have identified variants in genes such as FOXO3, MAPT, and CHRNA4 that correlate with structural and functional measures in frontal association cortex, including BA9, supporting a genetically influenced role of this region in executive processes and higher cognition. Overall, genetic associations with BA9 converge on neurodevelopmental, synaptic, and calcium signaling pathways that modulate vulnerability to mood and psychotic disorders, age-related cognitive decline, and variability in executive functioning.
Overview generated by GPT-4o (2026).
Region ID: 943
Hemisphere: bilateral
Atlas: Talairach labels 2mm
Full Quality Version: Download MP4
Full Quality Version: Download MP4
Wali Sidiqyar*, Gaurav Rudravaram*, Elyssa M. McMaster, Trent M. Schwartz, Adam M. Saunders, Kurt G. Schilling, Bennett A. Landman "Introducing SPINS: A Shared Public Visualization Library of Neuroanatomical Structures." Medical Imaging with Deep Learning- short paper
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