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Sex differences in the rat forebrain.

M C Diamond

    Brain Research
    |May 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Male and female rats show distinct cerebral cortex development patterns. Hormonal influences, particularly estrogen, play a role in these sex-based differences in cortical thickness and neuron distribution.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Comparative Anatomy

    Background:

    • Cerebral cortex development exhibits sex-specific patterns in early postnatal life.
    • Hormonal factors, including estrogen, are implicated in brain development and sexual dimorphism.

    Purpose of the Study:

    • To investigate sex differences in the developmental trajectories of cerebral cortical thickness in Long-Evans rats.
    • To explore the role of gonadal hormones in establishing these sex-based cortical asymmetries.

    Main Methods:

    • Longitudinal analysis of cerebral cortical thickness in male and female rats during the first postnatal month.
    • Assessment of cortical thickness following neonatal gonadectomy (ovariectomy in females, castration in males).

    Main Results:

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    • Males exhibit uniform cortical development rates, with the right cortex thicker than the left. Females show variable development, with the left cortex typically thicker.
    • Estrogen receptors are present at birth and diminish by one month; their concentration shows lateralization.
    • Neonatal ovariectomy in females reverses the typical left-sided cortical thickness advantage, mimicking the male pattern.

    Conclusions:

    • Early postnatal cerebral cortex development is sexually dimorphic in rats, with distinct patterns of thickness and lateralization.
    • Gonadal hormones, particularly estrogen, significantly influence the establishment of these sex-specific cortical asymmetries.