Efferent connections of the suprachiasmatic nucleus (SCN) in the Rat were evidenced using specific silver impregnation techniques designed to explore degenerating nerve fibers and terminals after a unilateral destruction of the suprachiasmatic nucleus. Suprachiasmatic efferences were confirmed and terminal buttons were identified in the septum, habenula and paraventricular nucleus of the thalamus. In addition suprachiasmatic fibers and nerve endings were revealed in the medial, cortical and central nuclei of the amygdala in the hippocampic subiculum, in different areas of the olfactory system and in the area parolfactoria.