Abstract
The pineal gland in active, waking red-cheeked sousliks differs from that of rats by its clear delineation into cortical and medullary zones, its larger pineocytes, and the well-marked polymorphism of their nuclei with numerous pseudokaryosomes. The onset of hibernation is accompanied by a decrease in the serotonin content of the pineal gland, disappearance of the division into medullary and cortical layers, and morphological features of reduced function. The changes thus developing are similar to those arising in the pineal gland after denervation.
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Popova, N.K., Kolaeva, S.G. & Dianova, I.I. State of the pineal gland during hibernation. Bull Exp Biol Med 79, 467–468 (1975). https://doi.org/10.1007/BF00832730
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DOI: https://doi.org/10.1007/BF00832730