Distribution of callosal fibers around the hand representations in monkey somatic sensory cortex.

Single or multiunit recording of responses to natural peripheral stimuli was used to map the representations of the upper limb and adjacent body parts in the postcentral gyrus of monkeys in which callosally projecting cells and/or axons had been prepared for labeling by previous section of the corpus callosum or contralateral injection of horseradish peroxidase. Subsequent demonstration of electrode tracks in relation to labeled cells and axons showed that no neurons with receptive fields distal to the elbow lay in callosally connected zones, irrespective of the cytoarchitectonic field or body representation in which they lay.