Abstract
Stimulation in the ventralis lateralis nucleus of the thalamus in the adult cat produces an afferent evoked potential in sensorimotor cortex and a projected volley in the pyramidal tract. The latter portion of this tract response probably represents a true cortical relay. The latency of the earliest portion of the tract response is too long to be due to current spread to internal capsule, yet not long enough to be accounted for by a cortical relay. Analysis of this phenomenon leads to the hypothesis of a collateral pyramidal tract projection to ventralis lateralis.
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