The bilateral Inferior Frontal Gyrus (IFG) is a cortical region of the frontal lobe located ventrolaterally, inferior to the middle frontal gyrus and anterior to the precentral gyrus, and is typically subdivided into pars opercularis, pars triangularis, and pars orbitalis. It participates in higher-order cognitive and motor functions, including language production and processing (notably in the dominant hemisphere as part of Broca’s area), response inhibition, working memory, and aspects of social cognition and affective processing. The IFG is heavily interconnected with temporal, parietal, and limbic regions, as well as premotor and motor areas, supporting integrative roles in speech articulation, syntactic and semantic processing, action observation, and controlled retrieval of information. Functionally, it contributes to both domain-specific processes (e.g., phonological and syntactic operations) and domain-general executive control, making it a key hub in large-scale fronto-temporal and fronto-parietal networks. Inferior frontal gyrus
The bilateral inferior frontal gyrus (IFG)—encompassing Broca’s area and adjacent regions in Talairach 1 mm space—has been implicated in genetic and GWAS findings related to language, executive function, and psychiatric risk. Variants in FOXP2 and CNTNAP2 have been linked to IFG structure and activation during speech and language tasks, and polygenic scores for educational attainment and cognitive ability show associations with gray matter volume and cortical thickness in IFG subregions. Large-scale imaging–genetics consortia (e.g., ENIGMA, UK Biobank) report that common variants near genes involved in synaptic function, axon guidance, and neurodevelopment (such as DCC, NPTN, and MIR137-related loci) are associated with IFG morphology and functional connectivity. Psychiatric and neurodevelopmental GWAS—particularly for schizophrenia, major depression, ADHD, autism spectrum disorder, and bipolar disorder—consistently show case–control differences and polygenic risk–brain associations in IFG, often in tasks tapping response inhibition, working memory, and language processing, suggesting that genetically influenced variation in IFG structure and function contributes to liability for these disorders and related cognitive traits.
Overview generated by GPT-4o (2026).
Region ID: 184
Hemisphere: bilateral
Atlas: Talairach labels 1mm
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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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