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Related Experiment Videos

Brain development in the neonatally decorticated rat.

B Kolb, I Q Whishaw, D van der Kooy

    Brain Research
    |November 12, 1986
    PubMed
    Summary

    Neonatal decortication in rats causes significant brain structure abnormalities, unlike adult decortication. This suggests the cortex has minimal role in subcortical development and function.

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    Neuroscience·2015

    Area of Science:

    • Neuroscience
    • Developmental Neuroscience
    • Comparative Neurology

    Background:

    • The neocortex plays a crucial role in brain development and function.
    • Understanding the impact of early-life cortical damage is vital for developmental neuroscience.

    Purpose of the Study:

    • To investigate the long-term morphological and pathway consequences of neonatal versus adult neocortical ablation in rats.
    • To compare the effects of decortication at different developmental stages on subcortical structures.

    Main Methods:

    • Rats underwent neonatal (1 or 5 days) or adult neocortical ablation.
    • Brain weights, subcortical structure morphology, and retrograde degeneration were analyzed.
    • Fluorescent retrograde tracers (True blue, Nuclear yellow) were used to map afferent pathways.

    Main Results:

    • Neonatal decortication led to a misshapen thalamus, shrunken brainstem, and altered hippocampus/subiculum.
    • Gliosis and calcification were absent in 1-day decorticates but present in 5-day and adult decorticates.
    • Most subcortical afferents were present, but some pathways (e.g., to ventral tegmental area, thalamus) were absent.

    Conclusions:

    • The developing cortex has a limited role in programming subcortical structure formation and connections.
    • Cortical and subcortical structures contribute uniquely to behavioral control.
    • Neonatal decortication results in severe, uncompensated structural deficits, aligning with behavioral findings.

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