[The biological clock in mammals: structure and function].

Jul 29, 1999Postepy higieny i medycyny doswiadczalnej

The mammalian biological clock: how it is built and how it works

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Abstract

The mammalian circadian timing system consists of three main components: entrainment pathways, pacemakers, and efferent pathways.

Light serves as the primary cue for regulating circadian rhythms.
The suprachiasmatic nuclei (SCN) act as the central pacemaker of the circadian timing system.
Nonphotic stimuli influence SCN activity through pathways like the intergeniculate leaflet (IGL) and the geniculohypothalamic tract (GHT).
Interactions between nonphotic and photic signals impact the SCN's response to environmental changes.

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The mammalian circadian timing system has three principal components: entrainment pathways, pacemakers and efferent pathways that couple the pacemaker to effector systems which exhibit temporal organization for physiological processes and behaviour. Light is the primary circadian Zeitgeber and the suprachiasmatic nuclei (SCN) functions as the major pacemaker in the mammalian circadian timing system. A number of investigators have focused attention on the intergeniculate leaflet (IGL) and the geniculohypothalamic tract (GHT) that mediate the effects of nonphotic stimuli on SCN activity and how these pathways interact with photic information being transmitted to the SCN.

[The biological clock in mammals: structure and function].

Abstract

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