The bilateral Left Cerebrum.Frontal Lobe.Inferior Frontal Gyrus.Gray Matter.Brodmann area 44, as defined in the Talairach 2 mm Atlas, corresponds to a portion of the inferior frontal gyrus typically associated with language-related and motor-speech functions, particularly phonological processing and aspects of speech production. In the dominant (usually left) hemisphere, this region forms a core component of Broca’s area, integrating premotor planning with higher-order linguistic functions and contributing to articulation and syntactic processing; in both hemispheres, it also participates in action observation and imitation networks. Its cytoarchitecture is characterized by agranular frontal cortex with distinct laminar organization, and it is interconnected with temporal and parietal language areas, premotor cortex, basal ganglia, and thalamic nuclei via major white matter tracts such as the arcuate fasciculus. There is no direct Wikipedia article for “Brodmann area 44” as a standalone entry; a closely related and encompassing structure is Broca’s area.
The bilateral left inferior frontal gyrus (IFG), Brodmann area 44, a core component of the language-related frontal network, has been implicated in multiple genetic and GWAS findings involving language, executive control, and neuropsychiatric phenotypes. Imaging-genetics studies and large-scale GWAS of cortical structure (e.g., ENIGMA consortia) have identified common variants influencing gray matter volume and cortical thickness in IFG, including loci in or near genes involved in neurodevelopment, synaptic signaling, and axon guidance (such as CNTNAP2, FOXP2-regulated networks, and other language-related pathways). BA44 activation and structure show heritability for speech and reading abilities, and genetic liability for developmental dyslexia and specific language impairment has been linked to altered IFG function or morphology. Polygenic risk for schizophrenia, bipolar disorder, and major depressive disorder correlates with structural and functional changes in left IFG, with GWAS-implicated genes related to glutamatergic and GABAergic transmission, synaptic plasticity, and cortical development contributing to these patterns. Variants associated with attention-deficit/hyperactivity disorder and autism spectrum disorder have also been tied to atypical IFG activation during tasks requiring response inhibition, social cognition, and language processing. Additional GWAS on cognitive traits, such as general intelligence, educational attainment, and verbal fluency, report enrichment in genes expressed in frontal language areas including BA44, supporting a role for this region as a convergent target of polygenic influences on higher cognitive and linguistic functions.
Overview generated by GPT-4o (2026).
Region ID: 748
Hemisphere: bilateral
Atlas: Talairach labels 2mm
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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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