suprachiasmatic nucleus

(redirected from Suprachiasmatic nuclei)

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 ?
The circadian rhythm is generated in the suprachiasmatic nuclei (SCN) located in the hypothalamus in mammals.
In mammals, the circadian clock is controlled by an area of the brain called the suprachiasmatic nuclei (SCN) which pulls every cell in the body into the same biological rhythm.
2-5) In many animal models of insulin resistance, dopaminergic activity within the hypothalamus, particularly the normal daily circadian peak within the suprachiasmatic nuclei, is diminished.
In fact each of our cells contains a mechanism for measuring time and our central clock consists of a pair of ganglia the size of a grain of rice called the suprachiasmatic nuclei, located in each hemisphere of the brain a couple of centimeters behind the bridge of the nose.
In the suprachiasmatic nuclei (SCN), the biochemical actions of PDE enzymes may play a role in circadian rhythmicity.
2] receptors, which are located only in the suprachiasmatic nuclei (SCN), the activity of the drug is specific.
MT1 and MT2 receptors are located in the brain's suprachiasmatic nuclei (SCN).
The synthesis and release of melatonin from the pineal gland is under the control of the suprachiasmatic nuclei (SCN) located in the hypothalamus, and the superior cervical ganglion (SCG) located in the neck region (43).
Studies have found that these changes are governed by a biological clock, which in mammals is located in two brain areas called the suprachiasmatic nuclei.
Lehman and Silver organized the recent symposium because of an interest that grew out of their studies of the suprachiasmatic nuclei (SCN).
All of these clocks are controlled by the master pacemaker of the hypothalamic suprachiasmatic nuclei (SCN), which synchronises all of the body's "peripheral" clocks with the outside world.
The body's main time-keeper resides in a region of the central brain called the suprachiasmatic nuclei, or SCN.