INAH-3 is the short form for the third interstitial nucleus of the anterior hypothalamus , and is the sexually dimorphic nucleus of humans. The INAH-3 is significantly larger in males than in females regardless of age  and larger in heterosexual males than in homosexual males and heterosexual females.
The term INAH interstitial nuclei of the anterior hypothalamus , first proposed in by a group of the University of California at Los Angeles, refers to 4 previously undescribed cell groups of the preoptic-anterior hypothalamic area PO-AHA of the human brain, which is a structure that influences gonadotropin secretion, maternal behaviour, and sexual behavior in several mammalian species.
One of these nuclei, INAH-3, was found to be 2. A study authored by Simon LeVay and published in the journal Science suggests that the region is an important biological substrate with regard to sexual orientation. This article reported the INAH-3 to be smaller on average in homosexual men than in heterosexual men, and in fact has approximately the same size in homosexual men as in heterosexual women.
LeVay noted three possibilities that could account for his findings: Both the differences in INAH3 and sexual orientation are linked to some third confounding variable such as a developmental event in prenatal or early life. LeVay found the first possibility most probable and noted that the second possibility was unlikely in light of various homologous studies in other species.
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He is renowned for his studies about brain structures and sexual orientation. LeVay was born on 28 August in Oxford , England. He is openly gay. LeVay held positions in neurobiology at the Harvard Medical School from to Much of his early work focused on visual cortex in animals, especially cats.
In , LeVay published "A difference in hypothalamic structure between heterosexual and homosexual men" in Science. This article reported a difference in average size between the third Interstitial Nucleus of the Anterior Hypothalamus INAH3 in the brains of heterosexual men and homosexual men: INAH3 was more than twice as large in heterosexual men as in homosexual men.
The INAH3 size of homosexual men was the same as that of women. LeVay wrote that "This finding indicates that INAH is dimorphic with sexual orientation, at least in men, and suggests that sexual orientation has a biological substrate. It is also possible, however, that these exceptions are due to technical shortcomings or to misassignment of subjects to their subject groups.
Does this worry you? It does meScience. Aug 30;() A difference in hypothalamic structure between heterosexual and homosexual men. LeVay S(1). Author information. Many people believe that sexual orientation (homosexuality vs. .. reduced size of INAH3 in male homosexuals compared with heterosexuals..
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Cloacal exstrophy Complex genito-urinary malformations occasionally occur during embryonic development resulting in the birth of XY males who, in addition to various malformations of the pelvis, have no penis. To identify and delineate the nuclei and determine their volume and shape we used three different stainings throughout the nuclei in every 15th section, i. These modified genitalia could also induce a general aversion toward sexual activity see Ref. There would be a critical concentration of testosterone required to masculinize this feature like other aspects of behavior in animals and humans see Fig.
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