ORGANIZATION OF THE DIFFUSE THALAMIC PROJECTION SYSTEM

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Abstract
The diffuse thalamic projection system has been studied in the cat by evoking recruiting responses with thalamic stimulation and determining their distribution with recording electrodes moved systematically through the hemisphere. The thalamic origins of this system include the centre median, intralaminar, anterior, ventralis anterior and anterior reticular nuclei. These components form a functionally interconnected unit, the excitation of any part of which sets the whole into activity. Radiations leave the thalamus principally from its rostral pole and to a lesser extent laterally, and project in a localized fashion to the caudate nucleus and to the associational cortex of the frontal, cingulate, orbital and suprasylvian portions of the hemisphere. The projection overlaps the motor region but avoids the sensory receiving areas. The results suggest that the diffuse projection system is organized for mass thalamic influence upon associated cortex.