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• W2045807788 startingPage "1013" @default.
• W2045807788 abstract "Both the pineal and the SCN are elements of the vertebrate multioscillator system although the relative importance of these 2 areas probably varies between, and possibly within, the different vertebrate classes. Extraretinal photoreception is a universal feature of submammalian vertebrates, and possibly of neonatal mammals, but is absent in adult mammals. Although the pineal systems of sumammalian vertebrates are photosensitive, the pineal system has been directly implicated as an extraocular site for the perception of entraining light cycles only in amphibians. In all other submammalian vertebrates extraretinal entrainment can occur in the absence of the pineal system although it is certainly conceivable that the pineal system may act as an alternate route of photoreception. These extraretinal-extrapineal receptors are located within the brain but the exact location(s) of these receptors within the brain is unknown. The hypothalamus would be likely area for this extraretinal photoreception, however, for several reasons: 1. Neurophysiological studies have identified light sensitive neurons in the frog's hypothalamus43. 2. The avian hypothalamus is a site of photoperiodic photoreception100–103. 3. The only other light sensitive structures known in vertebrates—the pineal system and the lateral eyes—are all derived embryologically from the hypothalamus. 4. The hypothalamus appears to be the site of a circadian clock and there may be advantages in having the photoreceptors and the clock anatomically close to one another. These considerations, of course, do not exclude the possibility that other brain areas may be involved as well. The reason behind the loss of extraretinal photoreception in mammals is uncertain. The shift to exclusive retinal photoreception in mammals may have been dictated by the extensive reorganization that occurred during the evolution of the mammalian brain. Or, perhaps, the increased size of the mammalian skull and overlying tissue made direct photoreception difficult and necessitated a shift to retinal photoreception. The persistence of extraretinal photoreceptors in submammalian vertebrates, however, underscores their importance in the sensory repertoire of vertebrates." @default.
• W2045807788 created "2016-06-24" @default.
• W2045807788 creator A5031844501 @default.
• W2045807788 creator A5033733434 @default.
• W2045807788 date "1982-09-01" @default.
• W2045807788 modified "2023-09-26" @default.
• W2045807788 title "Vertebrate circadian rhythms: Retinal and extraretinal photoreception" @default.
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• W2045807788 doi "https://doi.org/10.1007/bf01955345" @default.
• W2045807788 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/6751853" @default.
• W2045807788 hasPublicationYear "1982" @default.
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