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Gender differences in the rat corpus callosum: An ultrastructure study.
Duaa Al Qattan1, Amjad Shatarat2, Loai Alzghoul3
1Department of Pathology, The University of Jordan, Amman, Jordan.
Anatomia, Histologia, Embryologia
|July 27, 2019
Summary
This study investigated sexual dimorphism in rat corpus callosum (CC) axonal density. Results reveal region-specific differences in myelinated and unmyelinated axons between males and females.
Area of Science:
- Neuroscience
- Comparative Anatomy
- Neurobiology
Background:
- Sexual dimorphism is observed across all nervous system levels.
- The axonal composition of the corpus callosum (CC) exhibits controversial sexual dimorphism.
- Understanding these differences is crucial for comprehending brain structure variations.
Purpose of the Study:
- To quantitatively analyze differences in total, myelinated, and unmyelinated axon density within specific CC regions.
- To compare these axonal densities between adult male and female rats.
Main Methods:
- Adult male and female rats (n=6 pairs) were utilized.
- Corpus callosum sections from genu, anterior body, posterior body, and splenium were prepared.
- Electron microscopy and stereological methods quantified axon densities.
Main Results:
- Significant region-specific differences in myelinated axon density were found between sexes.
- Variations in unmyelinated axon density were also observed in a region-dependent manner.
- The ratio of myelinated to total axons differed between male and female rats across CC subregions.
Conclusions:
- The study confirms region-specific sexual dimorphism in the axonal composition of the rat corpus callosum.
- These findings contribute to the understanding of sex-based structural variations in the brain's white matter.
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