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THE SUPRACHIASMATIC NUCLEI AND THE PINEAL GLAND. Most human bodily functions and behaviours are not âsteady-stateâ. Instead, they fluctuate in 24-hour cycles, such as the sleeping and waking cycle and the cycles for body temperature, hunger, and the secretion of various hormones.
Scientists have determined that in mammals, this âbiological clockâ is located in two tiny structures called the suprachiasmatic nuclei (SCNs), located in the left and the right hypothalamus and bordering on the third ventricle. The neurons of these two nuclei are among the smallest in the brain.