The bilateral Right Cerebrum.Sub-lobar.Extra-Nuclear.White Matter.Anterior Commissure region in the Talairach 1 mm Atlas corresponds to the anterior commissure, a compact bundle of myelinated fibers forming a major interhemispheric white matter tract within the sublobar, extra-nuclear compartment of the cerebrum. This structure lies near the base of the forebrain, coursing anterior to the columns of the fornix and just above the lamina terminalis, and connects the temporal lobes and other regions of the two cerebral hemispheres. It plays an important role in interhemispheric transfer of information, particularly related to olfaction and portions of the temporal and limbic cortices, and serves as an alternative pathway for commissural communication alongside the corpus callosum. There is no direct link for this exact Talairach label; a related structure is the Anterior commissure.
The anterior commissure, a white matter tract connecting bilateral temporal and sub-lobar regions, has been implicated in genetic studies primarily through its role in interhemispheric connectivity rather than as an isolated structure in GWAS. Variability in its volume, fiber integrity, and microstructure has been associated with polygenic influences on neurodevelopmental and psychiatric phenotypes, including schizophrenia, bipolar disorder, autism spectrum disorder, and mood and anxiety traits, where risk variants in genes related to axon guidance, myelination, and synaptic plasticity (such as NRG1/ERBB4, DISC1, CNTNAP2, and several cell-adhesion and oligodendrocyte-related genes) show convergent effects on commissural and association fibers. Large imaging-genetics consortia (e.g., ENIGMA, UK Biobank) have reported heritable components of global white matter and callosal/commissural integrity that encompass the anterior commissure, linking polygenic scores for cognitive performance, educational attainment, and psychiatric risk to diffusion tensor imaging measures in commissural tracts, though specific SNP-level or locus-level findings focused exclusively on the Talairach-defined “Right Cerebrum.Sub-lobar.Extra-Nuclear.White Matter.Anterior Commissure” region remain limited. In addition, genetic variants affecting neurodevelopmental pathways (e.g., ROBO/SLIT, semaphorin/plexin signaling) and myelin-related processes (e.g., MBP, MAG, and related loci detected in GWAS of white matter microstructure) have been associated with alterations in interhemispheric connectivity that include the anterior commissure, and structural or microstructural changes in this tract have been reported in carriers of high-risk CNVs for schizophrenia and autism, suggesting that it is part of a broader genetically influenced network of commissural fibers involved in social cognition, emotional processing, and sensory integration.
Overview generated by GPT-4o (2026).
Region ID: 506
Hemisphere: bilateral
Atlas: Talairach labels 1mm
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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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