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Visualization of Cortical Modules in Flattened Mammalian Cortices
Published on: January 22, 2018
Modular architectonic organization of the insula in the macaque monkey
Henry C Evrard1, Nikos K Logothetis, A D Bud Craig
1Max Planck Institute for Biological Cybernetics, 72076, Tuebingen, Germany.
The Journal of Comparative Neurology
|August 1, 2013
Summary
Researchers mapped the macaque monkey insular cortex, identifying 15 distinct architectonic areas. These areas show consistent organization, suggesting modular processing for emotional behavior and interoception.
Area of Science:
- Neuroscience
- Primate Anatomy
Background:
- The insular cortex is crucial for integrating sensory, emotional, and cognitive information.
- Understanding its detailed anatomical organization is key for studying brain function.
Purpose of the Study:
- To establish a framework for high-resolution analysis of macaque insular cortex neuronal connections.
- To delineate the architectonic organization of the insular cortex in macaque monkeys.
Main Methods:
- Examination of serial coronal sections from 10 macaque brains.
- Alternating use of Nissl and Gallyas (myelin) staining techniques.
- Flat map reconstructions to analyze topological arrangements.
Main Results:
- Identification of 15 distinct architectonic areas within the insular cortex (4 granular, 4 dysgranular, 7 agranular).
- Consistent architectonic characteristics and topological arrangement of areas across brains.
- Sharp borders between areas, with some dysgranular areas showing potential subareas.
Conclusions:
- The insular cortex exhibits a consistent modular organization.
- This organization supports its role in homeostatic afferent processing and polymodal integration for emotional behavior.
- Findings align with theories on interoceptive thalamocortical projections and cortical gyrification.
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