The Left postcentral-gyrus-medial-segment, as defined in the brainCOLOR Atlas, corresponds to the medial portion of the postcentral gyrus within the parietal lobe, located just posterior to the central sulcus on the left hemisphere. This segment forms part of the primary somatosensory cortex (Brodmann areas 3, 1, and 2), with its medial extent bordering the interhemispheric fissure and often including regions representing the lower limb and trunk in the somatotopic (homuncular) map. Neurons in this region receive dense thalamocortical input from somatosensory relay nuclei, integrating tactile, proprioceptive, and nociceptive information to support conscious perception of body position, texture, and force. Functionally, the medial postcentral territory contributes to sensorimotor integration underlying posture, gait, and coordinated limb movements, and lesions here can produce contralateral sensory deficits predominantly affecting the leg and medial body surface. There is no direct Wikipedia article for this exact segment; see the related structure Postcentral gyrus.
Genetic associations specifically targeting the Left postcentral-gyrus-medial-segment as defined in the brainCOLOR Atlas are not yet well resolved at that fine-grained parcellation level, but converging evidence from imaging‑genetics and GWAS implicates genes and variants influencing somatosensory cortex structure and function more broadly in this region. Large-scale brain MRI GWAS (e.g., ENIGMA and UK Biobank) have identified common variants near genes involved in neurodevelopment, synaptic organization, and axon guidance (such as MIR137, MAPT, and genes in Wnt and FGF signaling pathways) that associate with cortical thickness, surface area, or gyrification in the postcentral gyrus and adjacent primary somatosensory regions. Polygenic risk for neurodevelopmental and psychiatric disorders—including autism spectrum disorder, schizophrenia, ADHD, and major depression—has been linked to structural and functional alterations in the postcentral gyrus and nearby sensorimotor networks, suggesting shared genetic influences on somatosensory processing and higher-order cognition. Additional GWAS have reported associations between somatosensory‐cortex morphology or activity and genetic liability for pain sensitivity, migraine, and chronic pain conditions, as well as traits like handedness and fine motor control, all of which heavily recruit postcentral regions. However, most findings remain at the level of lobar or gyral measures rather than the specific medial segment of the left postcentral gyrus, so current genetic associations for this brainCOLOR-defined region are inferred from broader postcentral and somatosensory cortex analyses rather than direct locus-specific GWAS signals.
Overview generated by GPT-4o (2026).
Region ID: 67
Hemisphere: Left
Atlas: brainCOLOR
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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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