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Related Experiment Videos

The morphological categorization of developing synaptic junctions.

S E Dyson, D G Jones

    Cell and Tissue Research
    |April 2, 1976
    PubMed
    Summary
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    This study quantifies synaptic development in rat occipital cortex using E-PTA staining. It reveals a shift from immature (Type E) to mature (Type A) synaptic junctions during postnatal development.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Cell Biology

    Background:

    • Synaptic development is crucial for brain function.
    • Quantitative models of synaptogenesis are needed for experimental studies.

    Purpose of the Study:

    • To develop a quantitative morphogenetic scheme for synaptic development in the rat occipital cortex.
    • To categorize synaptic junctions based on presynaptic density organization.

    Main Methods:

    • Electron microscopy with E-PTA staining was used to examine synaptic junctions.
    • Synaptic junctions were classified into five types (A-E) based on presynaptic density morphology.
    • Quantitative analysis of junction types was performed at various postnatal ages.

    Main Results:

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    • Type A (mature) junctions increased from 0.3% at 7 days to 25% in adults.
    • Type E (immature) junctions decreased from 42% at 7 days to 5% in adults.
    • Intermediate types (B-D) showed developmental trends supporting the proposed schemes.

    Conclusions:

    • A quantitative scheme for synaptic development, incorporating five junction types, was formulated.
    • The proposed schemes extend previous models and are suitable for experimental use.
    • This study provides a framework for understanding synaptogenesis in the visual cortex.