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Sexual Hormones and the Brain – Part 1 December 21, 2009

Posted by Geekgirl in brain, Developmental, Gender Identity, genetics, heredity, in the womb, transgender, transsexual.
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Over the next few days, I’ll be summarizing this article. I can’t print it in it’s entirety due to copyright restrictions. So I’ll summarize the information in bits and pieces.

Stay tuned. This will get interesting.

Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual Orientation

Alicia Garcia-Falgueras  Dick F. Swaab Netherlands Institute for Neuroscience, an Institute of the Royal Netherlands Academy of Arts and Sciences, Amsterdam, The Netherlands

Endocrine Development, 2010, vol 17, pp.22-35

Abstract

The fetal brain develops during the intrauterine period in the male direction through a direct actionof testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge. In this way, our gender identity (the conviction of belonging to the male or female gender) and sexual orientation are programmed or organized into our brain structures when we are still in the womb.

However, since sexual differentiation of the genitals takes place in the first two months of pregnancy and sexual differentiation of the brain starts in the second half of pregnancy, these two processes can be influenced independently, which may result in extreme cases in transsexuality.

This also means that in the event of ambiguous sex at birth, the degree of masculinization of the genitals may not reflect the degree of masculinization of the brain. There is no indication that social environment after birth has an effect on gender identity or sexual orientation.

Copyright © 2010 S. Karger AG, Basel

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1. Sex Hormones and the Brain – Part 2 « LGBT Latest Science - December 22, 2009

[…] } Summarized from Sexual Hormones and the Brain: An Essential Alliance for Sexual Identity and Sexual […]


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