One of the mysteries of the English language finally explained.
Each of a pair of small nuclei in the hypothalamus of the brain, above the optic chiasma, thought to be concerned with the regulation of physiological circadian rhythms.
- ‘The clock, which is located in the brain in the suprachiasmatic nucleus of the hypothalamus, programs daily cyclic changes in the body, thereby creating two distinct periods, a biological day and a biological night.’
- ‘A clump of nerve cells, known as the suprachiasmatic nucleus, regulates the brain's internal clock by measuring the amount of light the eyes register.’
- ‘The cycles themselves are controlled mainly by a region within the brain's hypothalamus known as the suprachiasmatic nucleus.’
- ‘Within mammals a region of the hypothalamus known as the suprachiasmatic nucleus acts as a central clock regulating rhythms throughout the rest of the body.’
- ‘In mammals it responds indirectly to light because it receives messages along fibres from nerve cells of the suprachiasmatic nucleus of the hypothalamus, which themselves receive signals from the eye via fibres of the optic nerve.’
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