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Related Experiment Videos

The development of dendritic spines in the human visual cortex.

A E Michel, L J Garey

    Human Neurobiology
    |January 1, 1984
    PubMed
    Summary

    Spine density on human visual cortex neurons increases rapidly after birth, peaking around 5 months. This density then declines to adult levels by age two, remaining stable thereafter.

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    Area of Science:

    • Neuroscience
    • Developmental Neuroscience
    • Neuroanatomy

    Background:

    • Pyramidal neurons in the human visual cortex (area 17) are crucial for visual processing.
    • Dendritic spines are key sites for synaptic connections and neuronal function.
    • Understanding the developmental trajectory of dendritic spines is vital for comprehending cortical maturation.

    Purpose of the Study:

    • To quantify the developmental changes in dendritic spine density on apical dendrites of layer III pyramidal neurons in the human visual cortex.
    • To establish the timeline of spine formation, maturation, and stabilization during human postnatal development.

    Main Methods:

    • Analysis of Golgi-impregnated sections from human brains spanning fetal age (33 weeks) to 30 years.
    • Measurement of spine density on a 50-micron segment of apical dendrites, 50-100 microns from the soma of layer III pyramidal neurons in area 17.

    Main Results:

    • Late fetal stage showed less than 30 spines per segment.
    • Neonatal brains exhibited approximately 50 spines per segment.
    • Spine density peaked around 5 months postnatally (approx. 80 spines).
    • Density decreased to about 50 spines by 2 years and remained stable into adulthood.

    Conclusions:

    • Dendritic spine density on layer III pyramidal neurons in the human visual cortex undergoes significant developmental changes.
    • A rapid increase followed by a decrease and stabilization characterizes spine development, with adult levels reached by age two.

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