Abstract
Whole-cell patch clamp recording techniques were applied to periglomerular (PG) cells in slices of the frog olfactory bulb (OB) to study the properties of the excitatory synapses in the triad formed by the olfactory nerve (ON) and the dendrites of mitral/tufted (MT) cells and PG cells. The postsynaptic response evoked by ON stimulation was glutamatergic and could be dissected into NMDA and non-NMDA components of equivalent amplitudes. The dendro-dendritic synapse between MT and PG cells could be activated following antidromic stimulation of the lateral and medial olfactory tract (LOT and MOT). In this case the postsynaptic potentials had amplitudes and durations comparable to those obtained by ON stimulation, the neurotransmitter was glutamate, but the synapse was largely dominated by the slow NMDA component.
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