Abstract
A host of experiments involving mainly rats and hamsters have led to the recognition of the suprachiasmatic nuclei (SCN) of the hypothalamus as the site of an endogenous circadian oscillator in mammals (Rietveld and Groos 1980; Meijer and Rietveld 1989).Using an autoradiographic tracing method Moore (1973) demonstrated a direct neuronal connection between the retina and the SCN in the rat, the retinohypothalamic projection (RHP). In addition to this anatomical finding there is other empirical support for the assumption that the SCN are a major pacemaker. Many behavioural circadian rhythms are abolished by complete bilateral SCN lesions or surgical islation (Rusak and Zucker 1979). Electrical stimulation of the SCN alters the phase of circadian rhythms in locomotor activity in rodents (Rusak and Groos 1982). With the aid of the 2-DG method, Schwartz et al. (1980) demonstrated a circadian rhythm in metabolic activity in the SCN, glucose utilization being high during the light period. No other brain area exhibits a similar rhythm. In accordance with this are electrophysiological studies (In- ouye and Kawamura 1979) showing that in vivo and in vitro the multiunit activity within the SCN is high during the light period and low during darkness.
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Rietveld, W.J. (1992). The Suprachiasmatic Nucleus and Other Pacemakers. In: Touitou, Y., Haus, E. (eds) Biologic Rhythms in Clinical and Laboratory Medicine. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78734-8_4
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