Word: hypothalamus
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...Greetings, conversationalists across the fruited plain, this is Rush Limbaugh, the most dangerous man in America, with the largest hypothalamus in North America, serving humanity simply by opening my mouth, destined for my own wing in the Museum of Broadcasting, executing everything I do flawlessly with zero mistakes, doing this show with half my brain tied behind my back just to make it fair because I have talent on loan from . . . God. Rush Limbaugh. A man. A legend. A way of life...
That specific part is found at the front of the hypothalamus in an area of the brain that is known to help regulate male sexual behavior. Within this site, LeVay looked at four different groupings of cells, technically referred to as the interstitial nuclei of the anterior hypothalamus, or INAH for short. Other researchers had already reported that INAH 2 and 3 were larger in men than in women. LeVay hypothesized that one or both of them might vary with sexual orientation as well...
Controlling the daily cycles is a cluster of 10,000 nerve cells -- altogether about the size of the head of a pin -- that are located in the hypothalamus, a segment of the brain. Some biological timepieces appear to take their cue from temperature or barometric pressure, but many are synchronized with the cycle of light and darkness caused by the rising and setting of the sun. Experiments conducted in caves, like the one in New Mexico, and others in special laboratories purposely remove all such cues. In Follini's module the temperature was a constant 69 degreesF, and the only...
...hypothalamus normally sends out a [hormone] signal that puts the reproductive system on 'go,'" Frisch says. If body weight is too low, the brain will not send any hormonal signals to the reproductive organs, and menstruation will not occur, she says. Once exercise is cut back and weight is regained, the menstrual cycle and ovulation will be restored, and pregnancy will be possible. "The situation is not irreversible," she says...
...experimental treatment with perhaps fewer ill effects involves a synthetic substance called nafarelin, similar to gonadotropin-relea sing hormone. Normally GnRH is released in bursts by the hypothalamus gland, eventually triggering the process of ovulation. But "if the GnRH stimulation is given continuously instead of in pulses," explains Dr. Robert Jaffe of the University of California, San Francisco, "the whole (ovulatory) system shuts off," and the endometrial implants "virtually melt away...