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Author (up) Reiter, R.J.; Rosales-Corral, S.; Coto-Montes, A.; Antonio Boga, J.; Tan, D.X.; Davis, J.M.; Konturek, P.C.; Konturek, S.J.; Brzozowski, T. url  openurl
  Title The photoperiod, circadian regulation and chronodisruption: the requisite interplay between the suprachiasmatic nuclei and the pineal and gut melatonin. Type Journal Article
  Year 2011 Publication Journal of Physiology and Pharmacology Abbreviated Journal  
  Volume 62 Issue Pages 269-274  
  Keywords Human Health; biological clock; chronodisruption; circadian rhythm; gastrointestinal melatonin; peptic ulcer; pineal gland; suprachiasmatic nucleus  
  Abstract Biological rhythms are essential for optimal health (1, 2). Throughout the course of human evolution, hominids were exposed to regularly alternating periods of light and dark during every 24-hour period. This evolutionary period, which for humans may have lasted for three million or more years, allowed species to take advantage of the light:dark cycle to adjust their physiology and to synchronize it with the prevailing light:dark environment. To take advantage of this information, vertebrates, including hominids, evolved a group of neurons to monitor the photoperiodic environment and to adjust organismal, organ and cellular function accordingly.

This paired group of light-responsive neurons is located in the mediobasal preoptic area at the diencephalic-telencephalic junction just anterior to the hypothalamus. Since these neurons lie immediately above the decussating axons of the optic nerve, i.e., the optic chiasma, they are named the suprachiasmatic nuclei (SCN) (3, 4). The SCN orchestrate all known circadian rhythms in vertebrates and are referred to as the master biological clock or the central rhythm generator.
 
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  Call Number LoNNe @ christopher.kyba @ Serial 522  
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