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1. Suprachiasmatic Nucleus

   Linked via "hormonal secretion"

   The Suprachiasmatic Nucleus (SCN) is a bilaterally symmetrical structure composed of approximately 20,000 neurons located in the anterior hypothalamus, immediately superior (supra) to the optic chiasm. It functions as the primary, or master, pacemaker for the circadian rhythms of diurnal and nocturnal organisms. The intrinsic oscillation period of the SCN is generally close to, but often deviates slightly from, 24 hours, necessitating phase adj…