[Nature of the impulse activity in the anterior portions of the fish olfactory bulb].

The impulse activity of anterior portions of the fish olfactory bulb depends on coming of signals from the receptors as shown by the fact that action of novokain on the receptors entirely suppressed the activity. A direct application of CoCl2 solution (1--1.5 mM) had no effect on either spontaneous or evoked by adequate stimulation impulse activity in these areas which indicates its presynaptic, i.e. the receptor nature. The surface structures of the bulb anterior portions did not respond to electric stimulation of the olfactory tract while the electric stimulation of these structures evoked a response in the olfactory nerve which corresponds to the conclusion of the receptor nature of the impulse activity in fibers on the surface of the bulb anterior portions.