The bilateral Right Cerebrum.Sub-lobar.Lentiform Nucleus.Gray Matter.Medial Globus Pallidus corresponds to the medial segment of the globus pallidus, a major basal ganglia output nucleus situated within the lentiform complex deep to the insular cortex. Composed primarily of densely packed GABAergic projection neurons, the medial globus pallidus receives inhibitory input from the striatum and modulatory input from the subthalamic nucleus, and in turn sends tonic inhibitory output to thalamic nuclei and brainstem motor centers, thereby exerting a crucial role in the regulation of voluntary movement, muscle tone, and motor learning. Functionally, this region participates in the indirect pathway of basal ganglia circuitry and is implicated in movement disorders such as Parkinson’s disease and dystonia, where altered pallidal activity disrupts normal thalamo-cortical signaling. There is no direct link for the “medial globus pallidus”; see the related structure Globus pallidus.
The medial segment of the globus pallidus (medial GP) within the lentiform nucleus, as defined in the Talairach 1 mm atlas, has been implicated in multiple genetic and GWAS-based associations, largely through its roles in basal ganglia motor and limbic circuitry rather than through region-specific genome-wide screens. Rare high-penetrance mutations in genes affecting basal ganglia development or signaling (e.g., ATP1A3, PANK2, PLA2G6, WDR45, XK, CP, GCDH) and monogenic forms of dystonia or parkinsonism (e.g., TOR1A, PRKRA, THAP1, PARK2, LRRK2, GBA) frequently involve structural or functional abnormalities of the medial globus pallidus, including iron deposition, gliosis, or atrophy, as shown by MRI or neuropathology. Polygenic GWAS of Parkinson’s disease, dystonia, essential tremor, and related movement disorders have repeatedly implicated genes in dopaminergic and synaptic pathways (e.g., SNCA, MAPT, GBA, LRRK2, VPS35, DRD2, GRIN2A) whose functional effects converge on basal ganglia circuits including the medial GP, and imaging-genetics work links common variants in such loci to altered pallidal volume or connectivity. In psychiatric and cognitive domains, large-scale studies from ENIGMA and UK Biobank demonstrate that common variants near or in genes involved in neurodevelopment, synaptic plasticity, and myelination (e.g., NPTN, BDNF, CAV2/CAV1, and others distributed across multiple loci) are associated with individual differences in basal ganglia volumes, including the globus pallidus, and with risk for disorders such as schizophrenia, bipolar disorder, obsessive–compulsive disorder, and attention-deficit/hyperactivity disorder, which show consistent case–control differences in pallidal structure and function. Collectively, genetic findings indicate that the medial globus pallidus is a convergent node for diverse risk variants affecting basal ganglia motor, cognitive, and affective circuits, even though few GWAS report locus effects uniquely localized to this specific pallidal subregion.
Overview generated by GPT-4o (2026).
Region ID: 457
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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