1. Department of Pharmacology, Faculty of Pharmaceutical Sciences, Kyushu University 60, 62, Fukuoka 812, Japan;2. Department of Physiology, Faculty of Medicine, Kyushu University 60, 62, Fukuoka 812, Japan
Abstract:
Spatial profile of a projection from retina to the suprachiasmatic nucleus (SCN) was studied by electrophysiological method. Stimulation of contralateral optic nerve evoked the fast positive and late large negative waves in only the ventrolateral but not the dorsolateral parts of the posterior SCN. This result, in agreement with anatomical evidence suggests that the late negative wave is due to excitatory synaptic potential in the SCN and has a role for elevating the neuronal activity in the ventrolateral part of the posterior SCN daytime.