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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Updated: Aug 14, 2025

Isolation of Sensory Neurons of Aplysia californica for Patch Clamp Recordings of Glutamatergic Currents
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Sensory processing in external globus pallidus neurons.

Yvonne Johansson1, Maya Ketzef2

  • 1Department of Neuroscience, Karolinska Institutet, 17177 Stockholm, Sweden; Sainsbury Wellcome Centre for Neural Circuits and Behaviour, University College London, London, UK.

Cell Reports
|January 14, 2023
PubMed
Summary
This summary is machine-generated.

The external globus pallidus (GPe) integrates sensory information via distinct pathways. Prototypic cells use the subthalamic nucleus and indirect pathway, while arkypallidal cells use direct pathway medium spiny neurons (MSNs).

Keywords:
CP: Neurosciencebasal gangliaexternal globus pallidusin vivo whole-cell recordingsoptogenetic silencingprototypic and arkypallidal cellssensory processing

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Area of Science:

  • Neuroscience
  • Basal Ganglia Research
  • Sensory-Motor Integration

Background:

  • The external globus pallidus (GPe) is crucial for behavior and movement control.
  • GPe contains prototypic and arkypallidal cells with overlapping inputs.
  • The specific sensory inputs to these GPe cell types remain largely unknown.

Purpose of the Study:

  • To identify the neural pathways conveying sensory information to GPe prototypic and arkypallidal cells.
  • To characterize how whisker stimulation responses are shaped in these distinct GPe subpopulations.

Main Methods:

  • In vivo whole-cell recordings in mouse GPe.
  • Optogenetic silencing techniques.
  • Analysis of responses to whisker stimulation.

Main Results:

  • Sensory integration in prototypic GPe cells is modulated by the subthalamic nucleus and indirect pathway MSNs.
  • Sensory integration in arkypallidal GPe cells is primarily influenced by direct pathway MSNs.
  • Demonstrates differential sensory input pathways for distinct GPe cell types.

Conclusions:

  • GPe subpopulations receive sensory information from distinct neural populations.
  • This supports the model of two parallel, functionally and anatomically different pathways within the GPe.
  • Highlights the specialized roles of GPe cell types in sensory processing and behavior.