CORTICOCORTICAL CONNECTIONS OF THE CEREBRAL CORTEX LYING WITHIN THE ARCUATE AND LUNATE SULCI OF THE MONKEY (MACAC A MULATTA)

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Abstract
The technique of physiol-ogical neuronography was applied to the buried cortex of the arcuate and lunate sulci in the monkey (Macaca mulatta). Differences in the anterior and posterior banks of these sulci were evident. In general, the anterior bank of the arcuate sulcus fired locally anterior to itself while the posterior bank fired widely and strongly behind itself. The anterior bank of the lunate fired widely anterior to itself, whereas the posterior bank fired locally behind itself. The buried cortex of the arcuate sulcus fired the buried cortex of the homolateral lunate and vice versa. Contralateral strong firing into homologous area of buried cortex within the arcuate and lunate sulci was the rule. Electrical stimulation of the buried cortex of the sulci produced conjugate eye movements, and high-frequency stimulation of the arcuate posterior or anterior, produced an immediate centering of the eyes if they were not centered at the time of stimulation.

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