Document Detail

Circadian rhythms and photoperiodism.
MedLine Citation:
PMID:  3836815     Owner:  NLM     Status:  MEDLINE    
The circadian timing system plays a critical role in the regulation of seasonal modifications in reproductive function. By detecting and transducing changes in the day-length (photoperiod), the neural substrates of the circadian system, including the supra-chiasmatic nuclei of the hypothalamus, trigger reproductive activity or quiescence at the appropriate seasons of the year in photoperiodic species. The circadian system also plays a role in the expression of endocrine changes that occur with seasonal breeding. Surges in luteinizing hormone secretion in female hamsters, for example, are either expressed daily during reproductive quiescence or suppressed on three out of the four days of the cycle during the breeding season. By such mechanisms a daily timer can be used in the regulation of cyclic events of much longer period.
M C Moore-Ede; M L Moline
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ciba Foundation symposium     Volume:  117     ISSN:  0300-5208     ISO Abbreviation:  Ciba Found. Symp.     Publication Date:  1985  
Date Detail:
Created Date:  1986-09-23     Completed Date:  1986-09-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0356636     Medline TA:  Ciba Found Symp     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  23-37     Citation Subset:  IM; S    
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MeSH Terms
Circadian Rhythm*
Hormones / physiology
Reg. No./Substance:

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