Periglomerular cells are interneurones that modulate the primary sensory information in the olfactory bulb. It was originally assumed that periglomerular cells constituted a homogeneous GABAergic population in the rat olfactory bulb, but in other species studies addressing this are scarce. However, several authors have shown that this neuronal type exhibits extraordinarily heterogeneous neurochemical features. The aim of this review is to compile and describe in detail the expression patterns of neuronal markers in the rat olfactory bulb, in particular in periglomerular cells, and to compare such information with previous data on other macrosmatic and microsmatic animals. Interspecies differences in the neurochemical composition of periglomerular cells could indicate different modes in the modulation of olfactory information.
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