Olfactory bulb projections of the rat

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Abstract
Ten rats with lesions in the olfactory bulb were used in this study. Degenerating fibers were followed by the Nauta‐Gygax silver impregnation technique and terminal changes were evaluated by the original Nauta technique. In these animals degenerating fibers can be traced into the lateral olfactory tract with projections to the olfactory tubercle, the fiberarchitectonic subareas of area 51 (with relative sparing of 51d), lateral olfactory nucleus, anterior amygdaloid area, cortical amygdaloid neucleus, medial amygdaloid nucleus and basomedial amygdaloid nucleus. Evidence for a projection to the lateral ventral entorhinal area is noted in all animals. No changes are noted in subiculum, hippocampus and stria terminalis; nor in the central, baso‐lateral or lateral amygdaloid nuclei.