Bilateral Right Cerebrum.Frontal Lobe.Middle Frontal Gyrus.Gray Matter.Brodmann area 9 corresponds to a dorsolateral prefrontal cortical region implicated in higher-order executive functions, including working memory, abstract reasoning, cognitive flexibility, and strategic planning. Cytoarchitectonically, Brodmann area 9 is characterized by a well-developed granular layer IV and distinct pyramidal cell layers III and V, consistent with its role in corticocortical integration and top-down control of behavior. Functionally, this region participates in the regulation of attention, goal-directed behavior, and the monitoring and manipulation of information in working memory, frequently showing activation during tasks requiring complex decision-making and moral or social judgment. There is no direct link for this exact Talairach label; a closely related structure is Dorsolateral prefrontal cortex.
Genetic associations involving the bilateral right middle frontal gyrus (Brodmann area 9) primarily emerge from neuroimaging genetics and GWAS of cortical morphology, cognitive traits, and psychiatric disorders rather than from studies targeting this specific Talairach-defined parcel. Variants near genes such as MAPT, PCDH family members, and those enriched in neurodevelopmental and synaptic pathways have been linked to frontal cortical thickness, surface area, and gyrification, with BA9 commonly implicated in large consortia (e.g., ENIGMA) that map SNPs to regional frontal morphology. BA9 plays a central role in executive function and working memory, and polygenic influences on these traits, including loci near CACNA1C, DRD2, and COMT, show structural and functional correlates in this region. Psychiatric GWAS for schizophrenia, bipolar disorder, major depression, ADHD, and obsessive–compulsive disorder repeatedly implicate frontal circuitry, with imaging–genetics studies reporting that risk alleles in genes such as ZNF804A, NRGN, and GRM3 are associated with altered BA9 activation, connectivity, or gray matter volume during tasks engaging cognitive control. Frontal BA9 abnormalities also appear in genetic studies of autism spectrum disorder, where synaptic and chromatin-remodeling genes (e.g., SHANK3, CHD8) have been linked to atypical frontal development, and in GWAS of intelligence and educational attainment, whose polygenic scores correlate with BA9 volume and functional engagement. Although no single variant is uniquely specific to right BA9 in the Talairach 2 mm atlas, convergent genetic evidence connects this region to polygenic architectures underlying executive cognition, higher-order social and emotional processing, and vulnerability to common psychiatric conditions.
Overview generated by GPT-4o (2026).
Region ID: 944
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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