Summary
In the pars distalis, the pars intermedia and the pars tuberalis of the hypophysis of Rana temporaria, an annual mitotic cycle is described.
In the pars distalis there exists a gradient of mitotic activity, corresponding to a gradient of distribution of the PAS positive cells.
In the pars distalis, the rate of cell degeneration and of cell renewal of the PAS positive cells seems to be faster than of the orange G positive cells.
The replacement of degenerated PAS positive cells of the pars distalis seems to occur mainly during the months immediately following on the period of maximal activity of the PAS positive cells.
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Dierickx, K., Goossens, N. & van den Branden, C. Cyclical mitotic activity in the adeno-hypophysis of Rana temporaria . Z. Zellforsch. 115, 579–586 (1971). https://doi.org/10.1007/BF00335722
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DOI: https://doi.org/10.1007/BF00335722