The Left medial-orbital-gyrus, as defined in the brainCOLOR Atlas, corresponds to the medial portion of the orbitofrontal cortex located on the ventral surface of the frontal lobe, adjacent to the midline and superior to the orbits. This region is strongly implicated in reward valuation, affective decision-making, and the integration of sensory, visceral, and emotional information to guide goal-directed behavior. It receives extensive input from limbic structures (including the amygdala) and sensory association cortices, and projects to other prefrontal and subcortical areas involved in motivation and autonomic regulation. Damage or dysfunction in this area has been associated with impaired reward-based learning, altered social behavior, and mood or anxiety disturbances. There is no direct Wikipedia article for the “medial orbital gyrus”; a closely related structure is the Orbitofrontal cortex.
The left medial orbital gyrus, part of the medial orbitofrontal cortex (OFC) as defined in systems like the brainCOLOR atlas, has been repeatedly implicated in genetic studies of psychiatric, cognitive, and reward-related traits, although most findings concern the broader medial OFC rather than that specific parcel. Imaging GWAS have linked common variants affecting cortical thickness or surface area in medial OFC regions to genes involved in synaptic function and neurodevelopment (for example, variants near MAPT, HMGA2, and loci associated with global cortical measures), while polygenic scores for educational attainment, intelligence, and intracranial volume show modest associations with OFC morphology. Medial OFC, including the left medial orbital gyrus, frequently appears in genetic and imaging-genetic studies of major depressive disorder, bipolar disorder, and schizophrenia, where risk variants in genes such as CACNA1C, ZNF804A, and DRD2, as well as genome-wide polygenic risk scores, correlate with altered OFC volume or activity during emotion and reward processing. GWAS of personality traits and substance use (e.g., risk-taking, neuroticism, alcohol and nicotine dependence) also point to genetic influences on OFC structure or function, with implicated loci often mapping to dopaminergic and glutamatergic signaling pathways that modulate reward valuation and impulse control. Overall, genetic associations for the left medial orbital gyrus are largely inferred from studies of medial OFC structure and function, converging on neurodevelopmental, synaptic, and neurotransmitter-related genes that contribute to vulnerability for mood disorders, psychosis, addiction, and variation in cognitive and personality traits.
Overview generated by GPT-4o (2026).
Region ID: 65
Hemisphere: Left
Atlas: brainCOLOR
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Full Quality Version: Download MP4
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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