[Complex action potentials of the secondary neurons of the rat olfactory bulb].

Complex action potentials (background and evoked by the lateral olfactory tract stimulation) were recorded from the secondary neurons of the olfactory bulb. The amplitude and duration of the complex action potentials changed depending on the synchronous appearance and combination of their elementary components. It is supposed that they were recorded in cases when the electrode was located near the spike-generating zones and that there are many such zones in the dendrites of the secondary neurons. The evoked action potentials appeared with different latencies (about 1 ms, about 2 ms, about 3 ms). Data are presented indicating that the antidromic response arises with the first latency and the responses with other latencies are synaptic. Synaptic responses were found more often than antidromic ones. These data suggest a variable representation of excitatory synapses in the secondary neurons (besides the excitatory olfactory glomerulus input).