Abstract
The distribution of monoamine axons and terminals within the spinal cord of a primate (Macaca mulatta) was studied with the Falck-Hillarp histofluorescence technique for the demonstration of biogenic amines. Catecholamine and indoleamine varicosities appeared qualitatively similar to those previously reported for the rat although the indoleamine terminals were difficult to visualize and were not studied in great detail. Catecholamine fibers innervate the substantia gelatinosa, marginal layer, intermediolateral cell column, ventral horn and the region surrounding the central canal. The location of monoamine axons, as revealed by spinal cord ligation, corresponds to that in the rat and cat with the exception of the dorsolateral region of white matter where fluorescent axons are not visible in the primate.
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