Bilateral Left Cerebrum.Frontal Lobe.Precentral Gyrus.Gray Matter.Brodmann area 44 corresponds approximately to the inferior frontal region associated with language-related motor functions, commonly linked to Broca’s area in the dominant (usually left) hemisphere. Cytoarchitectonically, Brodmann area 44 is a subdivision of the frontal lobe cortex characterized by granular frontal cortex layers and connections with premotor, auditory, and parietal association areas. Functionally, it is implicated in speech production, phonological processing, syntactic structuring, and aspects of action planning and sequencing, including complex orofacial and hand movements. Lesions in this area, especially on the left side, are classically associated with non-fluent (Broca’s) aphasia and deficits in expressive language and articulatory planning, while bilateral involvement may affect broader motor and cognitive control of language-related behaviors. Broca’s area
Genetic associations involving the bilateral Left Cerebrum.Frontal Lobe.Precentral Gyrus.Gray Matter.Brodmann area 44 (often overlapping with inferior frontal/ventral premotor regions implicated in speech, language, and motor planning) have emerged mainly through imaging genetics and GWAS of brain structure and language-related traits. Large neuroimaging GWAS consortia (e.g., ENIGMA, UK Biobank) have identified common variants near genes such as FOXP2, CNTNAP2, KIAA0319, DCDC2, and ROBO1 that influence cortical thickness, surface area, or activation patterns in inferior frontal and adjacent precentral regions, broadly encompassing BA44, in relation to speech production, phonological processing, and reading abilities. Structural and functional alterations in BA44 have been linked to variants in FOXP2 and related pathways in developmental language disorder, stuttering, and specific learning disorders (including dyslexia), and to genes involved in synaptic plasticity and axon guidance that modulate connectivity of the dorsal language/motor stream. GWAS of handedness and motor coordination have implicated loci affecting fronto-parietal motor circuits that include the precentral gyrus, while psychiatric and neurodevelopmental disorder studies (e.g., autism spectrum disorder, schizophrenia, ADHD) report that polygenic risk scores and variants in synaptic and neurodevelopmental genes correlate with altered morphology or activation in inferior frontal and precentral regions overlapping BA44 during language, inhibition, and motor tasks. Although many associations are regionally coarse and not restricted to BA44 in the Talairach 2 mm atlas, convergent evidence supports a genetic contribution to the structural and functional variability of this frontal precentral BA44 territory, particularly in relation to speech and language, motor planning, and higher-order cognitive control.
Overview generated by GPT-4o (2026).
Region ID: 690
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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