suprachiasmatic nucleus


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Related to suprachiasmatic nucleus: pineal gland

anterior hypothalamic area

the rostral portion of the hypothalamus generally located internal to the region of the optic chiasm; contains the following nuclei: anterior hypothalamic nucleus [TA] (nucleus anterior hypothalami [TA]), anterior periventricular nucleus [TA] (nucleus periventricularis ventralis [TA]), interstitial nuclei of anterior hypothalamus [TA] (nuclei interstitiales hypothalami anteriores [TA]), lateral preoptic nucleus [TA] (nucleus preopticus lateralis [TA]), medial preoptic nucleus [TA] (nucleus preopticus medialis [TA]), median preoptic nucleus [TA] (nucleus preopticus medianus [TA]), paraventricular nucleus [TA] (nucleus paraventricularis hypothalami [TA]), periventricular preoptic nucleus [TA] (nucleus preopticus periventricularis [TA]), suprachiasmatic nucleus [TA] (nucleus suprachiasmaticus [TA]), and supraoptic nucleus [TA] (nucleus supraopticus [TA]). The latter cell group consists of dorsomedial, ventromedial, and dorsolateral parts.
See also: hypothalamus.

suprachiasmatic nucleus

A small hypothalamic nucleus lying at the base of the third ventricle, directly above the optic chiasm. This nucleus generates the brain's circadian rhythm. To entrain its rhythm with the natural day-night cycle, the nucleus is innervated by optic axons via the accessory optic tract; it also receives axons from the lateral geniculate nucleus of the thalamus, and serotonergic axons from the midbrain raphe nuclei. The suprachiasmatic nucleus sends most of its axons to the paraventricular nucleus of the hypothalamus.
See also: nucleus

suprachiasmatic nucleus

anatomic nucleus which innervates the pineal gland; thought to play a part in the management of circadian rhythms.
References in periodicals archive ?
Ruby of Stanford University and his colleagues report that the brain's hypothalamic suprachiasmatic nucleus (SCN)-best known for its role in governing the body's daily rhythms (SN: 12/3/88, p.
Until about 20 years ago, the brain's suprachiasmatic nucleus (SCN) was accepted as the one and only body clock.
Tasimelteon's ability to reset the master body clock in the suprachiasmatic nucleus (SCN), located in the hypothalamus, results in the entrainment of the body's melatonin and cortisol rhythms to align to the 24-hour day-night cycle.
The study of the human clock, which resides in a tiny collection of brain cells called the suprachiasmatic nucleus, has become a pressing issue.
A growing body of data suggests that tasimelteon's entraining effects are accomplished through a direct resetting of the master body clock, located in the suprachiasmatic nucleus (SCN) of the hypothalamus.
The signal to produce melatonin goes from the eyes to the biological clock, or suprachiasmatic nucleus (SCN), at the base of the brain.
These receptors are found in high density in the suprachiasmatic nucleus of the brain (SCN), which is responsible for synchronizing an individual's sleep/wake cycle.
She and her colleagues observed that when they gave the rats a chemical that blocked glucose use, two areas of the brain's hypothalamus - the arcuate nucleus and the suprachiasmatic nucleus - produced more neuropeptide Y.
And last year, researchers at the Netherlands Institute for Brain Research reported that homosexual men had a larger suprachiasmatic nucleus than heterosexual men.
The activity at MT1 and MT2 receptors in the suprachiasmatic nucleus (SCN) is thought to promote sleep.
In mammals, these circadian rhythms are in large part controlled by a portion of the brain called the suprachiasmatic nucleus (SCN)--as demonstrated, for example, by a hamster's loss of circadian activity cycles on an exercise wheel following removal of its SCN.