The bilateral Left Cerebrum.Sub-lobar.Insula, as defined in the Talairach 1 mm atlas, refers to the insular cortex located deep within the lateral sulcus, buried beneath the frontal, parietal, and temporal opercula of the left cerebral hemisphere. The insula is considered part of the sub-lobar cortex and is involved in multimodal integration of sensory, autonomic, and limbic information, contributing to interoception (perception of internal bodily states), visceral regulation, gustatory processing, affective and social-emotional processing, and aspects of pain perception and risk evaluation. Functionally, the left insula has been implicated in language-related processes (including articulation and speech planning), as well as in integrating emotional and cognitive components of experience. Its extensive connectivity with frontal, temporal, parietal, and limbic regions supports a role in salience detection, switching between default-mode and executive networks, and coordinating autonomic responses to salient internal and external stimuli.
Insular cortex
The bilateral left sub-lobar insula has emerged in imaging–genetics and GWAS literature as a key hub linking genetic variation to affective, interoceptive, and cognitive traits, with structural and functional metrics of the insula repeatedly associated with common polymorphisms in genes related to neurotransmission (e.g., SLC6A4/5-HTTLPR, DRD2, COMT), neurotrophic and synaptic pathways (e.g., BDNF Val66Met), and large-scale polygenic architectures for psychiatric and behavioral phenotypes. Large consortia such as ENIGMA and UK Biobank report that insular cortical thickness and surface area show significant SNP-based heritability and multiple genome-wide significant loci, many mapping to genes involved in neuronal development, axon guidance, and synaptic plasticity, while polygenic risk scores for major depressive disorder, schizophrenia, bipolar disorder, autism spectrum disorder, and anxiety traits correlate with insular morphology or activation patterns. GWAS and candidate-gene studies have linked insula structure or activity—often overlapping or extending to the Talairach sub-lobar insula—to risk alleles for substance use (e.g., nicotine and alcohol dependence), pain sensitivity, eating disorders, and obesity-related traits, as well as cardiovascular and autonomic markers, consistent with the insula’s role in interoception. Although most studies do not isolate the exact “Left Cerebrum.Sub-lobar.Insula” Talairach 1 mm label, converging genetic evidence indicates that variation in and around this insular region is a key mediator of genetic risk for diverse neuropsychiatric, behavioral, and somatic traits.
Overview generated by GPT-4o (2026).
Region ID: 448
Hemisphere: bilateral
Atlas: Talairach labels 1mm
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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