The bilateral GM Secondary somatosensory cortex Parietal operculum OP3 R, as defined in the Juelich maxprob thr25 1mm atlas, corresponds to a cytoarchitectonically distinct subregion (OP3) of the parietal operculum within the human secondary somatosensory cortex (SII). This region is located on the upper bank of the lateral sulcus in the posterior insular–parietal opercular area and is involved in higher-order somatosensory processing, including integration of tactile, proprioceptive, and nociceptive information, as well as aspects of sensorimotor integration and possibly somatosensory attention. Neuronal populations in OP3 receive convergent input from primary somatosensory cortex and thalamic nuclei and contribute to bilateral, sometimes multimodal, representations of the body. There is no direct Wikipedia article for “Parietal operculum OP3,” but it is part of the broader secondary somatosensory cortex: Secondary somatosensory cortex.
The bilateral GM Secondary somatosensory cortex Parietal operculum OP3 (right hemisphere) from the Juelich maxprob thr25 1 mm atlas lies within the parietal operculum/SII region, for which genetic associations are largely indirect and inferred from broader somatosensory, parietal, or operculum-level analyses rather than OP3-specific loci. Twin and heritability studies show moderate to high genetic influence on somatosensory cortex thickness, surface area, and functional responses, with common variants in genes related to neurodevelopment (e.g., neuronal migration, axon guidance, synaptic plasticity) contributing to inter-individual variability in this region’s structure and function. Large-scale GWAS of cortical morphology (e.g., ENIGMA and related consortia) have identified variants near genes such as MIR924HG, TBR1, and others that affect parietal and peri-sylvian cortical thickness or surface area, likely encompassing the parietal operculum, but without pinpointing OP3 specifically. Functionally, parietal opercular/SII regions have been implicated in pain processing, touch, and sensorimotor integration, and GWAS of chronic pain, migraine, and somatosensory phenotypes often highlight genes involved in nociception (e.g., SCN9A, TRPM8, CACNA1A) and central pain modulation; imaging–genetics work suggests that variants in such genes modulate activation or connectivity in somatosensory and opercular cortices, though associations are again not restricted to OP3. The parietal operculum also participates in networks implicated in neurodevelopmental and psychiatric disorders such as autism spectrum disorder, ADHD, and schizophrenia, for which risk genes (e.g., those affecting synaptic scaffolding, glutamatergic signaling, and cortical circuit formation) have been linked to altered somatosensory and peri-sylvian cortical organization; however, current evidence connects these genes to broader regional or network-level changes rather than uniquely to bilateral OP3. Overall, while genetic influences on structure and function of the parietal operculum/SII are well supported, no robust, OP3-specific GWAS findings or single-gene associations have yet been established, and most links remain at the level of general somatosensory cortex, peri-sylvian parietal regions, or distributed sensorimotor and pain networks.
Overview generated by GPT-4o (2026).
Region ID: 64
Hemisphere: bilateral
Atlas: Juelich maxprob thr25 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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