The bilateral Left Cerebrum.Frontal Lobe.Inferior Frontal Gyrus.Gray Matter.Brodmann area 9, as defined in the Talairach 2 mm Atlas, corresponds to a portion of the dorsolateral prefrontal cortex involved in higher-order executive functions, including working memory, cognitive control, planning, and aspects of sustained attention. Situated in the frontal lobe’s superior part of the inferior frontal gyrus, BA9 integrates multimodal information and contributes to abstract reasoning, decision-making, and the regulation of goal-directed behavior. This region also plays roles in the modulation of emotional responses and social cognition through its extensive reciprocal connections with limbic structures and other prefrontal areas. There is no direct link for “Brodmann area 9” as a standalone article; a closely related and encompassing structure is the Dorsolateral prefrontal cortex.
The bilateral left inferior frontal gyrus (IFG) in Brodmann area 9 has been repeatedly implicated in genetic studies of cognitive and psychiatric traits, although most findings derive from imaging genetics and GWAS of cortical measures rather than Talairach-specific labels. Variants in genes influencing synaptic plasticity and neurodevelopment—such as BDNF (e.g., Val66Met), COMT (Val158Met), and DISC1—have been associated with structural and functional differences in dorsolateral prefrontal and inferior frontal regions that overlap BA9, affecting working memory, executive control, and language-related processes. Large-scale GWAS of cortical thickness and surface area (e.g., ENIGMA and UK Biobank studies) have identified multiple loci (including NEGR1, CADM2, and genes in glutamatergic and GABAergic pathways) that modulate prefrontal gray matter, with BA9 often falling within these prefrontal parcels. Genetic liability for schizophrenia, bipolar disorder, and major depressive disorder—captured via polygenic risk scores—has been linked to reduced gray matter volume or altered activation in BA9/IFG during cognitive tasks, and risk variants in genes such as CACNA1C, ZNF804A, and GRM3 show effects on prefrontal structure and connectivity. GWAS of traits like educational attainment, general cognitive ability, ADHD, and risk-taking behavior also point to overlapping genetic architectures influencing BA9 morphology and function, suggesting that this region serves as a convergence point for common variants shaping higher-order cognition, emotional regulation, and vulnerability to psychiatric disorders.
Overview generated by GPT-4o (2026).
Region ID: 899
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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