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Updated: Jul 1, 2026
09:55
Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
Published on: September 5, 2018
Architectonic subdivisions of neocortex in the gray squirrel (Sciurus carolinensis)
1Department of Psychology, Vanderbilt University, Nashville, Tennessee, USA.
Anatomical Record (Hoboken, N.J. : 2007)
|September 10, 2008
Summary
Squirrel brain mapping reveals distinct architectonic fields using advanced visualization techniques. This detailed study enhances understanding of rodent cortical organization and function.
Area of Science:
- Neuroscience
- Comparative Anatomy
Background:
- Squirrels possess highly visual systems with complex cortical structures.
- Understanding cortical organization is crucial for comparative neuroscience.
Purpose of the Study:
- To precisely map and delineate cortical fields in gray squirrels.
- To identify novel cortical areas and refine existing ones.
Main Methods:
- Reconstruction of cortical subdivisions from serial brain sections (coronal, sagittal, horizontal).
- Immunohistochemical and histochemical staining for various markers (parvalbumin, calbindin, VGLUT2, zinc, cytochrome oxidase, myelin, Nissl substance, SMI-32).
Main Results:
- Multiple visualization techniques confirmed consistent boundaries between cortical areas.
- Primary sensory areas identified by sparse zinc, rich parvalbumin/VGLUT2 in layer 4, and higher cytochrome oxidase/myelin.
- Primary motor cortex characterized by large SMI-32 labeled pyramidal cells.
Conclusions:
- The study provides a refined map of the gray squirrel cortex, including previously undescribed areas.
- Squirrel cortical organization shows both similarities and differences compared to other rodents.
- This detailed map serves as a guide for identifying homologous fields and future research in rodents.
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