The bilateral Right Cerebrum.Limbic Lobe.Uncus.Gray Matter.Brodmann area 20 corresponds to cortex in the anterior medial temporal lobe, where the uncus (part of the parahippocampal gyrus and closely associated with the amygdala and hippocampal formation) blends into ventral temporal association areas classified cytoarchitectonically as Brodmann area 20. BA20 is a higher-order visual association region involved in complex object and face processing, semantic integration, and aspects of visual memory, while the uncus itself is strongly implicated in olfactory processing, emotional evaluation, and memory encoding due to its limbic connections. Functionally, this bilateral region is positioned at the interface of limbic (emotion and memory) and temporal association (visual and semantic) networks, contributing to the integration of detailed visual information with affective and mnemonic context. There is no direct Wikipedia article for this exact compound region; a closely related structure is the Uncus.
The bilateral right limbic uncus gray matter corresponding to Brodmann area 20 (ventral temporal cortex involving anterior parahippocampal and related regions) has been implicated indirectly in genetic studies through its roles in memory, emotion, and higher-order visual processing rather than via region-specific GWAS. Imaging genetics and large consortia such as ENIGMA have shown that common variants in genes influencing synaptic plasticity and neurodevelopment (e.g., BDNF, NRGN, CACNA1C, COMT, DISC1) are associated with structural and functional variation in medial temporal and limbic cortices, including parahippocampal/uncal areas. GWAS of cortical thickness and surface area have identified loci near genes such as KIAA0586, TUBB, and others that influence temporal and limbic cortical morphology, while schizophrenia, bipolar disorder, major depression, and Alzheimer’s disease risk alleles (e.g., APOE, CLU, BIN1, complement pathway genes, and polygenic risk scores for psychiatric disorders) correlate with altered volume, connectivity, or activity in anterior medial temporal regions that encompass BA20-adjacent uncus/parahippocampal cortex. Additionally, genetic risk for temporal lobe epilepsy, autism spectrum conditions, and anxiety-related traits has been linked to abnormalities in medial temporal/uncal circuitry, though these findings typically reference broader hippocampal–parahippocampal networks rather than the specific Talairach-defined “Right Cerebrum.Limbic Lobe.Uncus.Gray Matter.Brodmann area 20” label.
Overview generated by GPT-4o (2026).
Region ID: 18
Hemisphere: bilateral
Atlas: Talairach labels 2mm
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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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