Abstract
To study zinc (Zn) mobility in the rat olfactory tract, brain distribution of 65Zn after injection into the olfactory bulb or amygdaloid nuclei was analyzed by autoradiography. Twenty-four hours after 65Zn injection into the olfactory bulb, 65Zn was distributed in the ipsilateral piriform cortex, amygdaloid nuclei and the anterior commissure. Moreover, in the case of injection of a higher level of 65Zn into the olfactory bulb, 65Zn was distributed in the ipsilateral entorhinal cortex in addition to the above regions. Twenty-four hours after 65Zn injection into the amygdaloid nuclei, 65Zn was distributed in the ipsilateral piriform and entorhinal cortex. These results suggest that Zn is intraneuronally transported along the olfactory tract. Zn may be taken up by the piriform neurons after release from the secondary olfactory neuron terminals and transported to the entorhinal area.
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