Abstract
The study of the structural and functional features of the pineal gland of rats under conditions of chronic stress and day and night lighting for 30 days has been conducted. Dark pinealocytes have been found to constitute the vast majority. The number of dark nuclei light pinealocytes have been found to increase. The pineal cells have been detected to have compact location in the parenchyma of the pineal gland, only on the periphery of the body the areas of rarefied location of cellular elements are found due to the processes of vacuolization. Morphological reorganization of the pineal parenchyma indicates that chronic stress combined with impaired photoperiod conditions caused by animals’ staying under continuous lightening for 30 days is accompanied by inhibition of its functional activity.
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