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Synaptic terminal parameters in unanesthetized rat cerebral cortex.

R M Devon, D G Jones

    Cell and Tissue Research
    |January 1, 1979
    PubMed
    Summary
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    Philosophical transactions. Series A, Mathematical, physical, and engineering sciences·2011

    Ultrastructural analysis of rat synapses revealed differences in synaptic morphology between stunning and carotid artery fixation methods. Carotid fixation showed more vesicle attachment sites and larger presynaptic terminals, suggesting membrane recycling may explain these synaptic variations.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Electron Microscopy

    Background:

    • Synaptic ultrastructure is crucial for neural function.
    • Understanding fixation artifacts is vital for accurate morphological studies.

    Purpose of the Study:

    • To compare synaptic ultrastructure in rat parietal cortex using two different fixation methods.
    • To identify potential fixation-induced artifacts in synapse morphology.

    Main Methods:

    • Examination of synapses from the molecular layer of parietal cortex in unanesthetized rats.
    • Comparison between two groups: one killed by stunning, the other by carotid artery perfusion fixation.
    • Quantitative analysis of synaptic features including vesicle attachment sites, presynaptic terminal size, and postsynaptic thickening.

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    Main Results:

    • No significant difference in synaptic type distribution between fixation groups.
    • Carotid artery fixation group showed a higher percentage of vesicle attachment sites.
    • Presynaptic terminals were larger in the carotid artery fixation group, with a shorter postsynaptic thickening.
    • Synaptic curvature was greater in the carotid artery fixation group.

    Conclusions:

    • Carotid artery perfusion fixation may preserve synaptic structures better than stunning.
    • Differences observed suggest membrane recycling as a potential mechanism.
    • The prevalence of positively curved synapses may indicate functional synapses in unanesthetized preparations.