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Claustrum: a case for directional, excitatory, intrinsic connectivity in the rat
1Department of Physiology and Pharmacology, State University of New York Downstate Medical Center, 450 Clarkson Avenue, MSC 31, Brooklyn, NY, 11203, USA. rena.orman@downstate.edu.
The Journal of Physiological Sciences : JPS
|September 3, 2015
Summary
The claustrum, a brain structure, exhibits intrinsic excitatory connectivity organized in rostro-caudal laminae. This organization allows for synchronized activity generation and spread within laminae, potentially contributing to seizure generation.
Area of Science:
- Neuroscience
- Cellular Biology
Background:
- The claustrum is a subcortical gray matter structure connected to neocortical and limbic areas.
- Its unique connectivity suggests a role in integrating widespread cortical activity.
Purpose of the Study:
- To investigate the intrinsic connectivity and organization of the claustrum.
- To understand the mechanisms of activity spread within the claustrum.
Main Methods:
- Anatomical studies using latexin immunohistochemistry to identify subregions and cellular organization.
- Physiological studies in disinhibited brain slices to examine claustral connectivity and activity spread.
Main Results:
- Claustrum shows distinct subregions and a laminar intrinsic organization aligned rostro-caudally.
- Spontaneous synchronized burst discharges were observed, with activity spreading within oblique laminae but not coronal planes.
- Activity spread was dependent on glutamatergic transmission and not inhibitory circuits.
Conclusions:
- The claustrum possesses intrinsic excitatory connectivity constrained within rostro-caudal laminae.
- It has the capability to generate and spread synchronized population activity within these laminae.
- This intrinsic property may play a role in seizure generation and propagation.
