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Developmental changes in the mongrel canine brain during postnatal life

B S Arant, W M Gooch

    Early Human Development
    |November 1, 1982
    PubMed
    Summary

    Canine brain development shows significant changes in weight and chemical composition from birth to maturity. These findings in mongol dogs offer insights into neonatal brain development and injury mechanisms.

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    Area of Science:

    • Neuroscience
    • Comparative Biology
    • Developmental Biology

    Background:

    • Establishing normal reference values for canine brain development is crucial for understanding developmental processes.
    • Previous research has highlighted similarities between canine and human brain development, suggesting the dog as a model organism.

    Purpose of the Study:

    • To establish normal values for brain growth, chemical composition, and morphology in mongrel dogs from birth to maturity.
    • To compare canine neonatal brain development with human fetal brain development.
    • To validate the mongrel dog as a model for studying neonatal human brain injury.

    Main Methods:

    • Studied 43 mongrel puppies (birth to 6 months) and 3 adult dogs.
    • Analyzed brain weight, chemical composition (sodium, potassium, chloride, protein, DNA), and morphologic features.
    • Histologic examination of brain tissue to observe developmental changes.

    Main Results:

    • Brain weight increased, while sodium, potassium, and chloride content decreased from birth to 60 days.
    • Brain water osmolality remained constant, despite changes in ion concentrations.
    • Protein to DNA ratios increased, peaking at 90 days.
    • Subependymal germinal zone diminished and disappeared by 60 days, mirroring human fetal development.

    Conclusions:

    • The mongrel dog exhibits distinct postnatal brain development patterns.
    • Canine brain development parallels human fetal brain development.
    • The mongrel dog is a suitable model for investigating neonatal brain injury mechanisms.

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