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Evolution of neuronal numerical density in the developing and aging human visual cortex.

G Leuba, L J Garey

    Human Neurobiology
    |January 1, 1987
    PubMed
    Summary
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    Human cerebral cortex neuronal density dramatically decreases from mid-gestation to infancy, stabilizing in adulthood. Aging shows a slight increase, with no evidence of neuronal loss in the human brain.

    Area of Science:

    • Neuroscience
    • Human Anatomy
    • Developmental Biology

    Background:

    • Neuronal numerical density is a key metric for understanding brain development and aging.
    • Previous studies have provided limited data on neuronal density across the entire human lifespan.

    Purpose of the Study:

    • To estimate neuronal numerical density in area 17 of the human cerebral cortex throughout development, from mid-gestation to old age.
    • To analyze age-related changes in neuronal density and distribution across cortical layers.

    Main Methods:

    • Estimation of neuronal numerical density in area 17 of the human cerebral cortex.
    • Analysis of samples from mid-gestation to old age, including different cortical layers.

    Main Results:

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    • Neuronal density is highest at 21 weeks gestation (over 1 million/mm3), decreasing sharply to ~90,000/mm3 at birth and ~40,000/mm3 by 4 months postnatally.
    • Density stabilizes around 35,000/mm3 in young adults, with layer IVc showing distinct developmental changes compared to other layers.
    • A slight increase in neuronal density is observed in old age (~44,000/mm3), with no conclusive evidence of neuronal loss.

    Conclusions:

    • Human cerebral cortex neuronal density undergoes significant developmental changes, stabilizing in early postnatal life.
    • Layer-specific differences in neuronal density are present during development and persist into adulthood.
    • Aging does not appear to cause significant neuronal loss in the human cerebral cortex, contrary to some previous assumptions.