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A sexually dimorphic nucleus in the human brain.

D F Swaab, E Fliers

    Science (New York, N.Y.)
    |May 31, 1985
    PubMed
    Summary

    Human brain anatomy reveals a sexually dimorphic cell group in the preoptic area. This nucleus is significantly larger and contains more cells in males than females, decreasing with age.

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    Area of Science:

    • Neuroscience
    • Human Anatomy
    • Neuroendocrinology

    Background:

    • The human hypothalamus, specifically the preoptic area, plays a crucial role in regulating reproductive functions.
    • Sexual dimorphism in brain structures is well-documented in various mammalian species, influencing behavior and physiology.

    Purpose of the Study:

    • To describe a sexually dimorphic cell group within the human hypothalamus.
    • To quantify the size and cell number differences between sexes and across the lifespan.

    Main Methods:

    • Morphometric analysis of post-mortem human brain tissue.
    • Cell counting and volume measurements of the identified nucleus.

    Main Results:

    • A distinct cell group in the preoptic area exhibits significant sexual dimorphism.
    • The nucleus is approximately 2.5 times larger and contains 2.2 times more cells in adult males compared to females.
    • Both volume and cell number decrease substantially with advancing age, from 10 to 93 years.

    Conclusions:

    • The preoptic area of the human hypothalamus contains a sexually dimorphic nucleus.
    • This nucleus undergoes age-related decline in size and cell population.
    • Its location suggests potential involvement in gonadotropin release and sexual behavior, warranting further functional investigation.

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