[Rhythm of the activity of the neurosecretory cells in the supraoptic hypothalamic nucleus of C57Bl mice]

Abstract

Rhythmic changes of the neurosecretory process in the hypothalamic supraoptic nucleus cells were studied in male mice C57Bl. The material was taken in 94 specimens in Leningrad, in April (during vernal equinox). Nuclear and nucleolar volumes in the neurosecretory cells, amount of the neurosecretory substance in cytoplasm served as criteria of the cellular functional activity. The circadian component of the rhythmicity cells which did not contain any neurosecretory material (the most active functionally). The peak time of the circadian component of the rhythm and the greatest range of the ultradian oscillations corresponded to the animals' day rest. The neurosecretory processes in the supraoptic nucleus reached the greatest activity at 3-4 P.M. when the nucleoli had the greatest volume and the number of cells free from the neurosecretory material was maximal.