Abstract
An ontogenetic study of the uptake of [ 14C]2-deoxy- d-glucose (2-DG) within the direct olfactory bulb projections and the tertiary olfactory projections was performed on rats of 1, 9 and 21 days old. Animals were exposed either to ethyl acetoacetate or to nest odor. In newborns, most of the direct olfactory bulb projections — anterior olfactory nucleus, anterior part of the olfactory tubercle, piriform cortex and nucleus of the lateral olfactory tract — appear labelled on films and therefore seem functional. No evidence of 2-DG uptake can be brought out in the cortical amygdala nucleus. As regards the tertiary olfactory projections, there is no apparent functional activity, neither in the medio-dorsal and medio-ventral thalamic nuclei nor in the hypothalamic nuclei, e.g. the lateral preoptic area and the lateral hypothalamus. In 9-day-old pups, the direct olfactory bulb projections and the tertiary olfactory projections appear wellcontrasted. Moreover, the patterns of labelling within the direct olfactory bulb projections are comparable to those observed in 21-day-old rats and in adult. These data are correlated with the postnatal development of the discriminating ability of the rat.
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