A nucleus in the HYPOTHALAMUS functioning as the primary circadian clock in mammals, and probably other vertebrates (see BIOLOGICAL CLOCK; CIRCADIAN RHYTHM). The suprachiasmatic nuclei (SCN) comprise unusually small, densely packed neurons and glial...

The suprachiasmatic nucleus (SCN) is a region of the brain, located in the hypothalamus, that is responsible for controlling endogenous circadian rhythms. The neuronal and hormonal activities it generates regulate many different body functions over a...