Abstract
A zinc-specific retrograde transport method has been employed to map the zinc-containing neuronal projections to the septal nuclei. Sodium selenite was infused iontophoretically into the lateral or medial septal nuclei to precipitate vesicular zinc as ZnSe in situ, and the neurons that were subsequently labeled by the retrograde transport of ZnSe to their perikarya were mapped. Zinc-containing cells of origin were found only in the hippocampal formation and predominantly in two regions thereof: (i) in s. oriens and deep s. pyramidale of fields CA3a and CA2 and (ii) in s. pyramidale of distal CA1 and adjacent prosubiculum.
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