The Left Accumbens-Area corresponds to the left nucleus accumbens, a key component of the ventral striatum situated at the junction of the head of the caudate nucleus and the putamen in the basal forebrain. It is heavily innervated by dopaminergic projections from the ventral tegmental area and glutamatergic inputs from the prefrontal cortex, hippocampus, and amygdala, integrating motivational, emotional, and contextual information. Functionally, this region plays a central role in reward processing, reinforcement learning, motivation, and the encoding of incentive salience, and it is implicated in addiction, mood disorders, and other neuropsychiatric conditions. Structurally, it is often subdivided into core and shell regions, which differ in connectivity and function, with the core more closely associated with motor output and the shell with limbic and autonomic regulation. Nucleus accumbens
The Left Accumbens-Area, corresponding to the nucleus accumbens region in the brainCOLOR atlas, shows robust genetic influences and has been implicated in multiple GWAS of brain structure and behavior, particularly involving dopaminergic and glutamatergic signaling genes. Large-scale imaging-genetics consortia (e.g., ENIGMA, UK Biobank) have identified heritable variation in accumbens volume and morphology associated with polymorphisms in genes such as DRD2, GRIN2B, CACNA1C, and variants near genes involved in synaptic plasticity and neurodevelopment, as well as polygenic scores for psychiatric and substance use traits. GWAS have linked accumbens structural measures to risk for major depressive disorder, bipolar disorder, schizophrenia, and attention-deficit/hyperactivity disorder, as well as to alcohol, nicotine, and other substance use phenotypes, reward sensitivity, risk-taking, and impulsivity. Furthermore, variants associated with obesity, body mass index, and eating behavior show correlations with accumbens-related measures, underscoring its role in appetitive and reward-driven behaviors. Overall, converging genetic evidence supports the Left Accumbens-Area as a key node where common psychiatric, addiction, and metabolic risk variants influence brain structure and function.
Overview generated by GPT-4o (2026).
Region ID: 2
Hemisphere: Left
Atlas: brainCOLOR
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Full Quality Version: Download MP4
Full Quality Version: Download MP4
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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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