He.
discovered there is a group on front of the.
hypothalamus is several times larger in millimeter of.
the male rats compared to the female rats. The cell.
group is very small but it could be easily observed on.
a stained slice when being viewed under a microscope.
More interestingly, Gorski's finding applied to the.
sexual orientation between males and females. That.
particular group of cell is known as the medial.
preoptic are has been involved in the sexual behaviors.
typically displayed in males. For instance, if there.
is a male rat has a injury medial preoptic area, he.
apparently couldn't indifferent to sex with another.
female. From the study of Gorski and his co-workers,.
we now know the androgen is the typical male hormone.
and the estrogen is the female hormone played a major.
role in bring about dimorphism during the fetus.
development. (LeVay/Hamer 23) Another finding also.
involved with Gorski and his colleagues at U.C.L.A,.
especially with his student, Dr. Laura S. Allen. They.
also found the dimorphic structure in the human brain.
A cell group named INAH3, shorten for the third.
interstitial nucleus of the anterior hypothalamus, in.
the medial preoptic region of the hypothalamus is.
about three times larger in men that in women.
(LeVay/Hamer 23) Animal studies make available a good.
deal of evidence for biological basis of disease, but.
in this case, sexual orientation. Through a careful.
exploitation of hormone level on rats, Gorski as been.
able to produce male rodents that demonstrate feminine.
behavior and injected into the female fetus that.
develop with the male fetus and it appear to be.
masculine because of the male testosterone. They also.
look and act more like males. In addition, they are.
less attractive to male mice (Gorman 60) Related to.
Gorski and Allen's study, Simon LeVay, a British.
biologist and neurologist at San Diego Salk Institute,.
who is also gay, performed another study for.
Biological Studies, in 1990. LeVay decided to check.