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Related Experiment Videos

Vertical ascending connections in the isocortex.

I Divac, S Marinković, J Mogensen

    Anatomy and Embryology
    |January 1, 1987
    PubMed
    Summary
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    Layer VI neurons in rat, marmoset, and hedgehog cortices show varied projections. Specific sublayers within Layer VI project to different cortical areas, revealing distinct neuronal circuitry across species.

    Area of Science:

    • Neuroscience
    • Comparative Anatomy

    Background:

    • The cortical layers represent distinct functional units within the brain.
    • Understanding the projection patterns of neurons in layer VI is crucial for deciphering cortical circuitry.

    Purpose of the Study:

    • To investigate the distribution and projection patterns of neurons in cortical layer VI across different mammalian species.
    • To compare the organization of layer VI neurons in rats, marmosets, and hedgehogs.

    Main Methods:

    • Application of fluorescent tracers to the cortical surface of rats, marmosets, and hedgehogs.
    • Analysis of labelled neuronal perikarya within different cortical layers and sublayers.
    • Tracing projections from specific neuron populations within layer VI.

    Main Results:

    Related Experiment Videos

    • Layer VI neurons were consistently labelled across all species and cortical regions studied.
    • Neuronal labelling in layer VI showed species-specific segregation, with rats predominantly in sublayer VIb, marmosets dispersed throughout layer VI, and hedgehogs showing intermediate segregation.
    • In rats, layer VIb neurons primarily project to layer I, while layer VIa neurons project to the thalamus.
    • Distinct neuronal populations within layer VI project to different targets (thalamus vs. cortical surface).
    • Very few neurons in deeper layers (III, V) and sublayer VIa project to superficial layers (I, II).

    Conclusions:

    • Cortical layer VI exhibits species-specific organization and projection patterns.
    • Layer VI neurons play a significant role in both intracortical and subcortical communication.
    • The findings highlight the diversity of cortical circuitry and neuronal connectivity across mammalian brains.