Globus Pallidus Externus In Movement Regulation is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
The Globus Pallidus Externus (GPe) is a critical component of the basal ganglia, serving as a central hub in the indirect pathway that regulates movement. This GABAergic nucleus plays a fundamental role in motor control, and its dysfunction is implicated in several movement disorders including Parkinson's disease and Huntington's disease. [1]
| Property | Value | [2]
|----------|-------| [3]
| Category | Basal Ganglia | [4]
| Location | Lentiform nucleus, lateral to the internal segment (GPi) | [5]
| Cell Type | GABAergic projection neurons | [6]
| Neurotransmitter | Gamma-aminobutyric acid (GABA) | [7]
| Function | Movement inhibition, motor timing |
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:4042028 | immature neuron |
The GPe is primarily composed of GABAergic projection neurons that express parvalbumin and produce dense axonal projections. These neurons have distinctive physiological properties:
The GPe occupies a pivotal position in the basal ganglia circuit:
Striatum (indirect) → GPe → Subthalamic Nucleus → GPi/SNr → Thalamus → Cortex
The indirect pathway, comprising the striatum → GPe → STN → GPi/SNr → thalamus circuit, acts as a "brake" on movement. The GPe serves as the first relay station in this pathway:
In Parkinson's disease, the loss of dopaminergic neurons in the substantia nigra pars compacta (SNc) leads to profound changes in GPe activity:
The classic model of Parkinson's disease suggests:
The GPe is increasingly recognized as a target for deep brain stimulation (DBS):
In Huntington's disease, the pattern of GPe dysfunction differs from PD:
The study of Globus Pallidus Externus In Movement Regulation has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Bugalho P. Globus pallidus externus in movement disorders. Movement Disorders (2008). 2008. ↩︎
Alam M, et al. Globus pallidus externus deep brain stimulation for Parkinson's disease. Brain Stimulation (2019). 2019. ↩︎
Steigerwald F, et al. Neuronal activity of the globus pallidus internus in Parkinson's disease. Annals of Neurology (2019). 2019. ↩︎
Ketzef M, et al. Functional organization of the external globus pallidus. Nature Neuroscience (2017). 2017. ↩︎
Abdi A, et al. The external globus pallidus: circuits and functions. Journal of Neural Transmission (2020). 2020. ↩︎
Hernandez VM, et al. Decline of striatal tyrosine hydroxylase and the GPe in Parkinson's disease. Brain (2021). 2021. ↩︎
Mallet N, et al. Dichotomy of striatal and pallidal function in movement disorders. Current Opinion in Neurobiology (2022). 2022. ↩︎