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Multiple Posterior Insula Projections to the Brainstem Descending Pain Modulatory System
Despoina Liang1, Charalampos Labrakakis1,2
1Department of Biological Applications and Technology, University of Ioannina, 45110 Ioannina, Greece.
International Journal of Molecular Sciences
|September 14, 2024
Summary
The insular cortex connects extensively to brainstem pathways that control pain. This research highlights the insula's role in modulating pain intensity via descending pain modulation.
Area of Science:
- Neuroscience
- Pain Research
- Neuroanatomy
Background:
- The insular cortex integrates sensory and emotional information.
- It is activated during pain perception.
- Its role in pain modulation is linked to limbic and descending pain systems.
Purpose of the Study:
- To investigate the detailed connectivity of the insular cortex to brainstem nuclei involved in descending pain modulation.
- To elucidate the insula's role in pain intensity coding and descending pain pathways.
Main Methods:
- Anterograde tracing using viral expression of mCherry fluorescent protein.
- Detailed examination of axonal projections from the insular cortex to specific brainstem nuclei.
Main Results:
- Extensive insular connections were found with the periaqueductal gray (PAG) and raphe magnus (RMg), key areas for descending pain control.
- Significant connections were also identified with the parabrachial nucleus (PBN).
- The insula projects to noradrenergic nuclei, including the locus coeruleus (LC), subcoereuleus (SubCD), and A5 nucleus.
Conclusions:
- The insular cortex has prominent connections with the descending pain modulatory system.
- These findings underscore the insula's significant role in pain processing through descending pathways.
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