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Related Experiment Videos

Postnatal development of axosomatic synapses in the rat visual cortex: morphogenesis and quantitative evaluation.

S Bähr, J R Wolff

    The Journal of Comparative Neurology
    |March 15, 1985
    PubMed
    Summary

    This study reveals how asymmetric and symmetric synapses develop on rat visual cortex neurons. It details synapse types and their changing distribution during postnatal development, offering insights into neuronal maturation.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Synaptic Plasticity

    Background:

    • Axosomatic synapses are crucial for neuronal communication.
    • Understanding their development explains neuronal circuit formation.
    • Synapse distribution varies between soma and dendrites.

    Purpose of the Study:

    • To investigate the postnatal development of axosomatic synapses in the rat visual cortex.
    • To elucidate the formation and distribution of asymmetric (Type 1) and symmetric (Type 2) synapses.
    • To understand the evolution of synapse types on the neuronal soma.

    Main Methods:

    • Analysis of synaptic junction morphology in rat visual cortex.
    • Classification of synapses into Type 1 (asymmetric), Type 2 (symmetric), and intermediate types.

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  • Quantitative assessment of numerical density and distribution of synapses during postnatal development (P1-P30).

    • Main Results:

    • Type 1 synapses exhibit a three-phase development, with transient increases in intermediate and thin Type 1 synapses.
    • Numerical density of axosomatic Type 1 synapses is low and decreases significantly between P17 and P30.
    • Axosomatic Type 2 synapses originate from growth-cone-like presynaptic elements and smaller presynaptic types.

    Conclusions:

    • The distribution of asymmetric and symmetric synapses on the soma is dynamic during postnatal development.
    • Intermediate synapses may represent precursors to mature asymmetric synapses.
    • The observed decrease in Type 1 synapses suggests a refinement of neuronal connectivity in the visual cortex.