recent advances on the study of circadian rhythm are reviewed and discussed on the following topics : its phylogeny ( the existence of extraretinal photoreceptors , photoreceptors for entrainment , the location of circadian oscillators ) , its ontogeny and aging , its central neural mechanism ( the ablation study of the suprachiasmatic nucleus ( scn ) , the electrophysiological study of the scn in multiple unit activity and single neuron activity in rat hypothalamic slice preparation , the use of 2-dg as a functional marker , the transplantation of the scn , the afferents and efferents of scn and its peptides ) , multiple oscillators theory ( the anticipatory activities in rats with scn lesions in response to the restricted feeding schedule , internal desynchronization , splitting ) , and its psychological significance .
C0020663
hypothalamic
C0038866
scn