[Proprioceptive afferents of the transcortical reflex in motor epilepsy:localisation of their thalamic relay in the cat (author's transl)].

In the Cat with a penicillin motor focus, a transcortical reflex (RTC) can be triggered by stimulation of the muscle or the cutaneous branch of the radial nerve (DR - SR). We tried here to identify at a suprabulbar level, the proprioceptive pathway involved in triggering RTC. Cerebellar ablation did not modify the reflex. On the other hand reversibly inactivation of a rostral-dorso-medial part of VPL (VPLr) receiving short latency proprioceptive afferents, reversibly abolished the TRC elicited through DR stimulation, while SR stimulation was still effective. It is thus assumed that muscle and cutaneous afferents responsible for eliciting the RTC run in parallel pathways with distinct relay zones within the VPL nucleus.U