Abstract
We characterized the neuronal properties of the anterior cingulate cortex (ACC) evoked by electrical stimulation of the medial thalamus (MT). MT stimulation sites were found by their neuronal responses to noxious stimuli. Of 487 units identified histologically in the rat ACC, 94% were activated trans-synaptically at different areas of the ACC. Six percent of MT-evoked ACC units were activated antidromically and all of these units projected to a specific nucleus of MT. We suggest that MT nuclei mediate different aspects of nociceptive information to specific ACC areas, and that nociceptive information in the MT is modulated reciprocally by activities from the ACC.
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