Circadian activity of the subcommissural organ (SCO) and paraphysis cerebri (PC), as judged by changes in the nuclear volume of the SCO ependymal and paraphyseal cells, was found in sexually tricular organs reaches its maximum at 16.00, and minimum at 24.00 (SCO), or 04.00 h (PC).
A circadian morphological rhythm of the pineal organ, as judged by changes in the nuclear volume of the photoreceptor cells, was found in sexually nature male Yellow-bellied toads (Bombina variegata) maintained continuously at 26 ?C and on a 17L/7D illumination cycle. The greatest nuclear volume occurred at the photophase (16.00 h), and the lowest at the end of the scotophase (4.00 h).
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.