User:Zelizimm/sandbox

History
Ideas of differences in the male and female brain circulated during the time of ancient Greek philosophers around 850 B.C. Aristotle claimed that males did not "receive their soul" until 40 days post-gestation and females did not until 80 days. In 1854, Emil Huschke discovered that "the frontal lobe in the male is all of 1% larger than that of the female." As the 19th century progressed, scientists began researching sexual dimorphisms in the brain significantly more. Until around 21 years ago, scientists knew of several structural sexual dimorphisms of the brain, but they did not think that sex had any impact on how the human brain performs daily tasks. Through molecular, animal, and neuroimaging studies, a great deal of information regarding the differences between male and female brains and how much they differ in regards to both structure and function has been uncovered.

Progesterone
Progesterone is a steroid hormone synthesized in both male and female brains. It contains characteristics found in the chemical nucleus of both estrogen and androgen hormones. As a female sex hormone, progesterone is more significant in females than in males. During the menstrual cycle, progesterone increases just after the ovulatory phase to inhibit luteinizing hormones, such as oxytocin absorption. It also plays a role during pregnancy, and in some cancers such as breast, ovarian, and endometrial.

In men, increased progesterone has been linked to adolescents with suicidal ideation.