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  • Title: [Effect of the epiphysis and hypophysis on the circadian organization of the wakefulness-primary sleep cycle in the frog Rana temporaria].
    Author: Belich AI, Sapozhkova GG.
    Journal: Zh Evol Biokhim Fiziol; 1987; 23(2):237-45. PubMed ID: 3495946.
    Abstract:
    Using continuous non-contact registration of the heart rate and motor activity in unrestrained frogs, studies have been made of the effects of hypophysectomy and epiphysectomy on functional state of the organism. It was shown that removal of the epiphysis alleviates the circadian physiological rhythm of natural changes of functional states in wakefulness-primary sleep cycle, whereas removal of the hypophysis results in additional cyclic rhythm of two functional states in the diurnal periodicity of the behaviour. The latter effect is considered to be the ultradian rhythm, which in the intact animals is masked by the circadian one modulated by natural diurnal illumination. It is suggested that removal of the epiphysis reveals endogenous rhythm of the activity typical of periodic regimes of the spontaneous excitation at early stages of ontogenesis.
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