The Human Suprachiasmatic Nucleus

This is a part of Clockwork Genes: Discoveries in Biological Time


In mammals, the controlling clock component that generates a 24-hour rhythm is the suprachiasmatic nucleus (SCN), located in a part of the brain called the hypothalamus. The SCN produces a signal that can keep the rest of the body on an approximately 24-hour schedule. This animation illustrates the location of the SCN in the human brain.

(Duration: 01 min 41 sec)
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