The bilateral Left Cerebrum.Sub-lobar.Lentiform Nucleus.Gray Matter.Medial Globus Pallidus corresponds to the medial segment of the globus pallidus, a major component of the basal ganglia located deep within the subcortical lentiform nucleus of the cerebrum. This region is composed predominantly of GABAergic projection neurons and functions as a critical output nucleus of the basal ganglia circuitry, receiving inhibitory input from the striatum and excitatory input from the subthalamic nucleus, and sending tonic inhibitory projections primarily to motor thalamic nuclei and brainstem targets. Through these pathways, the medial globus pallidus plays an essential role in regulating voluntary movement, muscle tone, and aspects of motor learning, and is implicated in movement disorders such as Parkinson’s disease and dystonia when its activity or connectivity is disrupted. There is no direct Wikipedia article specific to this Talairach-labeled region; a closely related and encompassing structure is the Globus pallidus.
The medial globus pallidus, part of the lentiform nucleus within the sub-lobar left cerebrum, has been implicated genetically through imaging–genetics and GWAS studies focusing on basal ganglia structure and related neuropsychiatric and movement disorders. Variants in genes involved in dopaminergic and basal ganglia circuitry—such as DRD2, ANKK1, and COMT—have been associated with volumetric and functional differences in globus pallidus regions, often in the context of reward processing, habit learning, and antipsychotic response. Large-scale brain MRI GWAS consortia (e.g., ENIGMA, UK Biobank–based studies) have identified multiple common variants across the genome (notably in loci near genes involved in neurodevelopment, synaptic signaling, and iron metabolism) associated with pallidal volume, though these findings typically report globus pallidus as a whole rather than specifically the medial segment. Clinically, monogenic movement disorders that heavily involve the globus pallidus, such as PANK2-related neurodegeneration with brain iron accumulation, ATP13A2- and PLA2G6-associated dystonias, and certain forms of hereditary chorea and dystonia, show structural and metabolic abnormalities in this region. Additionally, polygenic risk for disorders such as Parkinson’s disease, schizophrenia, obsessive–compulsive disorder, and Tourette syndrome has been linked to altered basal ganglia structure and function, including globus pallidus involvement, although genetic associations are generally reported at the systems level (basal ganglia/thalamocortical circuits) rather than with the medial globus pallidus specifically.
Overview generated by GPT-4o (2026).
Region ID: 456
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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