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
References in periodicals archive ?
Honma, "Separate oscillating cell groups in mouse suprachiasmatic nucleus couple photoperiodically to the onset and end of daily activity," Proceedings of the National Academy of Sciences of the United States of America, vol.
Reppert, "Individual neurons dissociated from rat suprachiasmatic nucleus express independently phased circadian firing rhythms," Neuron, vol.
Eichele, "The light-dark cycle controls peripheral rhythmicity in mice with a genetically ablated suprachiasmatic nucleus clock," The FASEB Journal, vol.
Ebling, "The role of glutamate in the photic regulation of the suprachiasmatic nucleus," Progress in Neurobiology, vol.
Pennartz, "Circadian modulation of GABA function in the rat suprachiasmatic nucleus: excitatory effects during the night phase," Journal of Neurophysiology, vol.
It may be attributed to a phase-resetting effect via melanopsin and the suprachiasmatic nucleus (Box, (18-24) page 30).
Inside the brain's hypothalamus lies a small structure called the suprachiasmatic nucleus, which contains cells that control the body's circadian rhythm.
A small area in the hypothalamus of the brain, called the suprachiasmatic nucleus (SCN), regulates most circadian activity.
The clock is a collection of nerve cells, called the suprachiasmatic nucleus, an impossibly long name that always shortened (even by neuroscientists) to SCN.
The circadian rhythm is a cycle of biochemical, physiological, and behavioral processes coordinated by the suprachiasmatic nucleus (SCN) of the anterior hypothalamus, which regulates the release of melatonin from the pineal gland to maintain the sleep/wake cycle.
Among their topics are cellular timekeeping: it's redox o'clock, regulating the suprachiasmatic nucleus circadian clockwork: interplay between cell-autonomous and circuit-level mechanisms, the plant circadian clock: from a simple timekeeper to a complex development manager, design principles of phosphorylation-dependent timekeeping in eukaryotic circadian clocks, how coordination between differentially regulated circadian clocks generates rhythmic behavior, and interplay between microbes and the circadian clock.