The bilateral Anterior thalamic radiation (ATR, R) is a major white matter tract connecting the anterior and mediodorsal nuclei of the thalamus with the prefrontal cortex, particularly the dorsolateral and medial prefrontal regions, via the anterior limb of the internal capsule. It carries thalamocortical and corticothalamic fibers involved in higher-order cognitive functions, including executive control, working memory, attention, and aspects of emotion and motivation, as well as integration of limbic and associative information. The ATR forms part of the fronto-thalamic circuitry implicated in neuropsychiatric and neurodegenerative disorders, where microstructural changes are often detected by diffusion MRI. There is no direct link, but the structure is closely related to the Internal capsule.
The bilateral anterior thalamic radiation (ATR), particularly in the right hemisphere as defined in the JHU ICBM tracts maxprob atlas, has been repeatedly implicated in genetic studies of white-matter microstructure, cognition, and neuropsychiatric risk. Large diffusion MRI GWAS (e.g., UK Biobank–based studies) have identified multiple common variants associated with fractional anisotropy and other diffusion metrics in the ATR, involving genes linked to axonal guidance, myelination, and neurodevelopment, such as those in the CNTN, LINGO, and NRG pathways, among others. Polygenic risk for schizophrenia, bipolar disorder, and major depressive disorder has been associated with microstructural alterations in thalamo-frontal tracts including the ATR, and several disorder-specific GWAS implicate loci that show downstream effects on ATR integrity, suggesting that genetic liability for these conditions may partly act through disruption of thalamo-cortical connectivity. ATR measures have also emerged in imaging-genetics studies of cognitive traits (e.g., processing speed, executive function, and general intelligence), where genetic variants associated with these traits correlate with ATR diffusion properties, supporting a heritable contribution to frontal-thalamic circuit efficiency. In addition, GWAS of neurodevelopmental and aging-related traits—including ADHD, autism spectrum conditions, and age-related cognitive decline—have linked polygenic profiles to ATR structure and connectivity, indicating that this tract serves as a convergent pathway through which diverse genetic influences shape attention, working memory, and vulnerability to mood and psychotic disorders.
Overview generated by GPT-4o (2026).
Region ID: 2
Hemisphere: bilateral
Atlas: JHU ICBM tracts maxprob thr25 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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