The bilateral inter-hemispheric precuneus is a medial parietal lobe region located on the medial surface of the cerebral hemispheres, bounded anteriorly by the marginal branch of the cingulate sulcus and posteriorly by the parieto-occipital sulcus. In the Talairach 1 mm Atlas, this area spans homologous territories in both hemispheres across the midline and is implicated in higher-order associative functions, including visuospatial processing, self-referential thought, episodic memory retrieval, and integration of sensorimotor and cognitive information. It forms a core hub of the default mode network and maintains extensive connections with frontal, parietal, temporal, and subcortical structures, supporting its role in internal mentation and consciousness-related processes. Precuneus
The bilateral inter-hemispheric precuneus—a core hub of the default mode network—has been repeatedly implicated in genetic studies linking common variants to brain structure, connectivity, cognition, and neuropsychiatric conditions. Twin and heritability studies show moderate to high heritability of precuneus volume, cortical thickness, and functional connectivity, with large ENIGMA and UK Biobank GWAS identifying multiple associated loci, including variants near genes involved in neurodevelopment, synaptic function, and myelination (for example, MIR137, GRIN2B, NRXN1, and genes in calcium-signaling and glutamatergic pathways, although no single locus is exclusive to the precuneus). Polygenic risk for Alzheimer’s disease (including APOE-associated risk) correlates with altered precuneus structure and metabolism, reflecting the region’s vulnerability to early amyloid deposition; GWAS of default mode network connectivity also implicate genes tied to Alzheimer’s and lipid metabolism. In schizophrenia, bipolar disorder, and major depressive disorder, risk variants collectively show effects on precuneus gray matter and connectivity patterns, and autism spectrum disorder and ADHD polygenic scores have been linked to atypical precuneus functional coupling. GWAS of traits such as intelligence, educational attainment, mind‑wandering, and self‑referential processing further indicate that alleles associated with higher cognitive performance or altered internal mentation are related to structural and functional variation in the bilateral precuneus, underscoring its role as a genetically influenced hub integrating cognition, memory, and self-related processes.
Overview generated by GPT-4o (2026).
Region ID: 988
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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