Corticocortical projections to the prefrontal cortex in the rhesus monkey investigated with horseradish peroxidase techniques

Neuroscience Research
K Kawamura, J Naito

Abstract

The corticocortical afferents innervating the prefrontal cortex in the monkey were studied by means of the retrograde axonal transport of horseradish peroxidase. After injection of small amounts (0.3-0.5 microliter) of this enzyme into various parts of the prefrontal cortex, many labeled neurons (mostly pyramids of 15-25 microns in diameter) were found in various cortical regions of the ipsilateral hemisphere. A small part of the prefrontal cortex received fibers from other parts of the same cortex. For example, area 8 receives many fibers from both the rostral part of area 9 and a small area adjacent to the inferior branch of the arcuate sulcus. On the other hand, area 9 in the inferior prefrontal convexity receives fibers from localized parts of areas 8 and 9 in the dorsolateral convexity as well as from area 6. It is also apparent that association connections from the dorsolateral to the inferior convexity are stronger than those going in the opposite direction. The prefrontal afferents from other cortical regions include many fibers originating from the posterior association cortex as well as some fibers arising in the cingulate and orbital gyri. The prefrontal cortex does not receive direct corticocortical fibers from the ...Continue Reading

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