The bilateral Inter-Hemispheric Superior Frontal Gyrus, as defined in the Talairach 2 mm Atlas, refers to the midline portions of the superior frontal gyrus spanning both cerebral hemispheres, situated anteriorly in the frontal lobe and bordering the interhemispheric fissure. This region lies predominantly in Brodmann areas 8 and 9 and is implicated in high-level executive functions, including working memory, attentional control, and aspects of self-referential and goal-directed cognition. Its interhemispheric positioning is associated with integration of bilateral frontal activity, contributing to coordinated planning, decision-making, and top-down regulation of behavior. There is no direct Wikipedia article for this specific Talairach-defined bilateral inter-hemispheric region; a related structure is the Superior frontal gyrus.
The bilateral inter-hemispheric Superior Frontal Gyrus, corresponding largely to medial prefrontal and dorsomedial frontal cortices in the Talairach 2 mm atlas, has been implicated in multiple genetic and GWAS findings, primarily through imaging genetics and large-scale brain-structure and function studies rather than region-specific candidate gene work. Variants in genes related to synaptic function, neurodevelopment, and cortical morphology (e.g., CNTNAP2, DISC1, BDNF, and polygenic risk scores for schizophrenia and major depressive disorder) have been associated with altered volume, cortical thickness, or activity in superior frontal/medial prefrontal regions. GWAS of cortical thickness and surface area (such as ENIGMA and UK Biobank analyses) have identified significant loci influencing frontal cortical morphology, including regions overlapping the superior frontal gyrus, and these structural differences often co-localize with genetic risk for psychiatric disorders like schizophrenia, bipolar disorder, depression, ADHD, and autism spectrum disorder. Functional imaging genetics has linked common variants in neurotransmitter-related genes (e.g., COMT Val158Met, 5-HTTLPR in SLC6A4) to differences in activation within superior frontal and adjacent medial prefrontal areas during executive function, working memory, and emotion regulation tasks, traits that themselves show genetic correlations with frontal cortical structure. Additionally, GWAS of cognitive traits (general intelligence, executive function, educational attainment) report genetic overlap with measures of frontal cortical thickness and connectivity, suggesting that polygenic influences on cognition are partly mediated via structural and functional variation in bilateral superior frontal regions, including the inter-hemispheric medial aspects captured by the Talairach labels.
Overview generated by GPT-4o (2026).
Region ID: 904
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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