GM Insula Ig2 L

Overview

The bilateral GM Insula Ig2 L region in the Juelich maxprob thr25 1 mm atlas corresponds to a left-sided granular insular subdivision within the posterior insular cortex, characterized by dense granule-cell–rich layer IV and strong thalamocortical input. This area is implicated in multimodal sensory integration, particularly somatosensory and visceral processing, and contributes to interoception, pain perception, and autonomic regulation. Cytoarchitectonically, Ig2 exhibits a distinct laminar pattern separating it from adjacent agranular and dysgranular insular fields, and functionally it participates in networks linking the insula with somatosensory, limbic, and prefrontal regions to support bodily awareness and emotional–salience processing. There is no direct link for “Insula Ig2 L”; a related structure is the Insular cortex.

The bilateral GM Insula Ig2 L region from the Juelich maxprob thr25 1mm Atlas falls within the broader insular cortex, whose genetics have been studied mainly at macroscopic rather than fine-grained subregional levels; thus, specific GWAS loci uniquely tied to Ig2 L are not yet well defined. However, large-scale imaging–genetics consortia such as ENIGMA and UK Biobank have identified genome-wide significant associations between insular cortical thickness or surface area and variants near genes involved in neurodevelopment, synaptic function, and axon guidance (for example, variants in or near MIR588, HMGA2, and WNT pathway–related genes), as well as strong heritability estimates for insular morphology. Polygenic overlap has been reported between insular structure and psychiatric traits including major depressive disorder, schizophrenia, bipolar disorder, and anxiety, as well as substance use phenotypes and neuroticism, consistent with the insula’s role in salience processing and interoception. Additionally, insular volume and thickness metrics show genetic correlations with cardiometabolic traits (such as body mass index and blood pressure) and pain sensitivity, suggesting pleiotropic genetic influences on both interoceptive brain networks and systemic physiological regulation, though these findings pertain to the insula as a whole rather than specifically to the Ig2 L subregion.

Overview generated by GPT-4o (2026).

Region ID: 120
Hemisphere: bilateral
Atlas: Juelich maxprob thr25 1mm

GM Insula Ig2 L – Black Background (Full Brain)

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GM Insula Ig2 L – White Background (Full Brain)

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Triplanar View – T1 Background

Triplanar View – Ghost Brain