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Biology of Sexual Identity Harry Benjamin's Syndrome (HBS)    Estimated incidence of HBS is 1 in 100.000 live births
The Transsexual Brain ,[object Object],[object Object],[object Object],[object Object]
MtF Brains ,[object Object],[object Object],[object Object]
Bed Nucleus of the Stria Terminalis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Localization of the BST ,[object Object],[object Object],[object Object],[object Object],Zhou, J.N. Hofman, M.A. Gooren, L.J. and Swaab, D.F..  A Sex Difference in the Human Brain and its Relation to Transsexuality.  NATURE, 378: 68-70 (1995)
Bed Nucleus of the Stria Terminalis Figure 2 : Representative sections of the BSTc innervated by vasoactive intestinal polypeptide (VIP). A: heterosexual man; B: heterosexual woman; C: homosexual man; D: male-to-female transsexual. Bar=0.5 mm. LV: lateral ventricle. Note there are two parts of the BST in A and B: small sized medial subdivision (BSTm), and large oval-sized central subdivision (BSTc) Zhou, J.N. Hofman, M.A. Gooren, L.J. and Swaab, D.F..  A Sex Difference in the Human Brain and its Relation to Transsexuality.  NATURE, 378: 68-70 (1995)
Bed Nucleus of the Stria Terminalis ,[object Object],[object Object],[object Object],[object Object],[object Object]
BSTc Volume Is Not Affected by Varying Sex Hormone Levels in Adulthood ,[object Object],[object Object],[object Object]
Small-Sized BSTc in MtF Not Due to Estrogen Treatment   ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Large-sized BSTc in MtF Not Due to Lack of Androgens ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Results & Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object]
2 nd  Study:  Methodology to Study BSTc ,[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Somatostatin Results Parallel VIP Results
What’s Missing in the Sexual Identity Picture? ,[object Object],[object Object],[object Object]
FtM Has Same Neuron Number in BSTc as Typical Male ,[object Object],[object Object],[object Object],[object Object],[object Object]
BSTc Neuron Number Is Not Related to Sexual Orientation ,[object Object],[object Object],[object Object],Kruijver, Frank P. M., Zhou, Jiang-Ning, Pool, Chris W. Hofman, Michel A.,. Gooren, Louis J. G And Swaab, Dick F.  Male-To-Female Transsexuals Have Female Neuron Numbers In A Limbic Nucleus.  J CLIN ENDOCRINOL METAB, 85: 2034-2041 (2000)
Genetics of MtF Transsexuality ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Genetics of FtM Transsexuality ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
Different Routes to Sexual Identity ,[object Object],[object Object],[object Object]

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8 Biology Of Sexual Identity

  • 1. Biology of Sexual Identity Harry Benjamin's Syndrome (HBS)   Estimated incidence of HBS is 1 in 100.000 live births
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  • 6. Bed Nucleus of the Stria Terminalis Figure 2 : Representative sections of the BSTc innervated by vasoactive intestinal polypeptide (VIP). A: heterosexual man; B: heterosexual woman; C: homosexual man; D: male-to-female transsexual. Bar=0.5 mm. LV: lateral ventricle. Note there are two parts of the BST in A and B: small sized medial subdivision (BSTm), and large oval-sized central subdivision (BSTc) Zhou, J.N. Hofman, M.A. Gooren, L.J. and Swaab, D.F.. A Sex Difference in the Human Brain and its Relation to Transsexuality. NATURE, 378: 68-70 (1995)
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