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I once heard of this structure on the Discovery Science channel and have since forgotten the name. The details I remember about it were that it is the central time-keeping device for the brain located in the geographic center of the human brain. The DSC only mentioned it in passing to describe a person with an abnormality in this structure. Can someone post some reliable research links and a short description of it? I don't trust google much and am not good at using it, so thanks!

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You are probably referring to the suprachiasmatic nucleus.

Note that, although this is the central clock, there are also so-called "peripheral clocks", for instance in the liver, pituitary and other organs that can finely tune rhythms in the organism.

You may also want to have a look at the Wikipedia page for circadian clock and references therein.

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okay thank you very much, that looks like what i was referring to. I also heard it was very very small, and the wikipedia article said 20k neurons and the size of a grain of rice. I'll remember circadian clock too! –  0xFFF1 May 5 '13 at 20:06
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Suprachiasmatic Nucleus is a part of Hypothalamus, which might be an interesting read as well - hypothalamus is very important –  Alex Stone May 5 '13 at 23:40

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