Seasonal changes in the suprachiasmatic nucleus of man
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چکیده
منابع مشابه
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15 صفحه اولRhythmic changes in spike coding in the rat suprachiasmatic nucleus.
The suprachiasmatic nucleus is regarded as the main mammalian circadian pacemaker but evidence for rhythmic firing of single units in vivo has been obtained only recently. The present study was undertaken to determine if rhythms could be seen using measures of activity in addition to the mean spike frequency. We investigated whether there were changes in the irregularity of cell activity measur...
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The dynamics of circadian rhythms needs to be adapted to day length changes between summer and winter. It has been observed experimentally, however, that the dynamics of individual neurons of the suprachiasmatic nucleus (SCN) does not change as the seasons change. Rather, the seasonal adaptation of the circadian clock is hypothesized to be a consequence of changes in the intercellular dynamics,...
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So what’s the fuss? In mammals, it is the site of an endogenous pacemaker that regulates 24 hour, circadian rhythmicity, synchronizing the phases and periods of a host of behavioral, physiological, and hormonal rhythms to the environmental light–dark cycle. The SCN also appears to function as a seasonal clock underlying the measurement of daylength. The SCN was first implicated as a master cloc...
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Regulated expression of a core set of clock genes is the basis of circadian timekeeping in vertebrates, as in other organisms. Clock genes are defined as being necessary to generate normal circadian rhythms, near 24 h oscillations in biological processes. With the enlargement of the brain in vertebrates, control of circadian rhythms became centralized. In lower vertebrates, such as fishes, liza...
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ژورنال
عنوان ژورنال: Neuroscience Letters
سال: 1992
ISSN: 0304-3940
DOI: 10.1016/0304-3940(92)90566-p