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Updated: Jun 13, 2026
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In-Vivo Calcium Imaging of Sensory Neurons in the Rat Trigeminal Ganglion
Published on: February 9, 2024
Single unit oscillations in rat trigeminal nuclei and their control by the sensorimotor cortex
F Panetsos1, A Sanchez-Jimenez
1Neurocomputing and Neurorobotics Research Group, Complutense University of Madrid, Avda Arcos de Jalon 118, 28037 Madrid, Spain. fivos.panetsos@opt.ucm.es
Neuroscience
|May 11, 2010
Summary
Neural oscillations, crucial for information processing, were discovered in the rat
Area of Science:
- Neuroscience
- Sensory Processing
- Computational Neuroscience
Background:
- Oscillatory activity is recognized as vital for information processing and coding across the central nervous system.
- Rats utilize rhythmic whisker movements for tactile perception, with rhythmic activity identified in the thalamus and cortex.
- Neural oscillations had not been previously reported in the sensory trigeminal complex (STC), the initial brain stem relay for whisker sensation.
Purpose of the Study:
- To investigate the existence and characteristics of neural oscillations in the vibrissae-related neurons within the STC.
- To determine the functional relevance of these oscillations in different STC nuclei based on their primary roles.
- To explore the origin of these oscillations and the influence of cortical control.
Main Methods:
- Electrophysiological recordings were performed on vibrissae-related neurons in the rat STC, including nuclei principalis (Pr5), oralis (Sp5o), interpolaris (Sp5i), and caudalis (Sp5c).
- Analysis focused on identifying and quantifying neural oscillations and their frequencies.
- Experiments involved decorticated animals to assess cortical influence on STC oscillations.
Main Results:
- Neural oscillations were demonstrated in vibrissae-related neurons across all examined STC nuclei.
- Oscillating neurons were more prominent in nuclei involved in tactile processing (Pr5: 17%, Sp5i: 26%) than in pain-related nuclei (Sp5o: 8%, Sp5c: 8%).
- Higher oscillation frequencies and percentages in Sp5i compared to Pr5 suggest a role in integrating multi-whisker input.
- Oscillations are generated within the brainstem, with differential cortical control observed, particularly during tactile stimulation.
Conclusions:
- This study provides the first evidence of neural oscillations within the sensory trigeminal complex, implicating rhythmic activity in whisker-related sensory processing.
- The findings suggest that oscillations play a differential role in tactile processing versus pain processing within the STC.
- Cortical pathways modulate brainstem oscillations, highlighting a top-down influence on sensory information processing in the STC.
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