Publication: Circadian and seasonal cortico-medullary variations in pinealocyte nuclear size. A comparative statistical analysis
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Date
1992
Authors
Cimas García, C. ; Martínez Soriano, F. ; Ruíz Torner, A.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Circadian and seasonal variations were
observed in the karyometric index of pinealocytes in the
cortical and medullary regions of the dista1 pineal body.
The study involved 70 Wistar rats over a 24-hour
interval(0:6, 10:00, 14:00, 18:00, 22:00,02:00,06:00 h)
during two natural photoluminous periods, i.e. late
summer (Long photoperiod) and Winter (Short
photoperiod). The results show a difference between the
high and low points of both photoperiods. Corticomedullary
differences are found at different times of day
during long photoperiod (0:6; 10:OO; 14:00 and 18:OO h.)
and short photoperiod (14:OO; 22:OO and 02:OO h.). The
varianza annalysse between nuclear volume and pointtime
and between nuclear volume, point-time and
location are significative. A high correlation between
circadian rhythms and volumetric variations in both
layers and photoperiod are found. The results also show
significant differences in cortico-medullary karyometric
indices between both seasons as well as between the
diurna1 and nocturna1 hours of both photoperiods. It is
suggested that the pineal body of the rat is influenced by
circadian and seasonal photoperiod and may have groups
of cells with different functional characteristics,
depending on their location within the gland
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