The external globus pallidus: Progress and perspectives

Daniel J. Hegeman, Ellie S. Hong, Vivian M. Hernández, C. Savio Chan*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

108 Scopus citations


The external globus pallidus (GPe) of the basal ganglia is in a unique and powerful position to influence processing of motor information by virtue of its widespread projections to all basal ganglia nuclei. Despite the clinical importance of the GPe in common motor disorders such as Parkinson's disease, there is only limited information about its cellular composition and organizational principles. In this review, recent advances in the understanding of the diversity in the molecular profile, anatomy, physiology and corresponding behaviour during movement of GPe neurons are described. Importantly, this study attempts to build consensus and highlight commonalities of the cellular classification based on existing but contentious literature. Additionally, an analysis of the literature concerning the intricate reciprocal loops formed between the GPe and major synaptic partners, including both the striatum and the subthalamic nucleus, is provided. In conclusion, the GPe has emerged as a crucial node in the basal ganglia macrocircuit. While subtleties in the cellular makeup and synaptic connection of the GPe create new challenges, modern research tools have shown promise in untangling such complexity, and will provide better understanding of the roles of the GPe in encoding movements and their associated pathologies.

Original languageEnglish (US)
Pages (from-to)1239-1265
Number of pages27
JournalEuropean Journal of Neuroscience
Issue number10
StatePublished - May 1 2016


  • Arkypallidal neurons
  • Npas1
  • Parkinson's disease
  • Parvalbumin
  • Prototypic neurons

ASJC Scopus subject areas

  • General Neuroscience


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