No abstract

Thalamic evoked potential (TEP) was recorded in VPM-VPL nuclei following ulnar and sciatic stimulation in humans. The latencies of the early positive deflection were found respectively at 9.6±1.5 and 21.2±3.1 msec for stimulation at the elbow and at the popliteal fossa. It was proved that TEP is not produced by muscular activity and is unaffected by attention or distraction. Stimulation of low threshold afferent fibers of the ulnar nerve was followed by TEP, even in the absence of EMG responses. Their nature is discussed. No clear evidence was found that group I afferent fibers of the sciatic nerve project to the thalamus. Group II cutaneous fibers project to the thalamus also through a fast route; late components of TEP (40–45 msec for the ulnar nerve stimulation) are assigned to group III excitation.

The authors report their experience in 39 stereotaxic operations performed on a group of 31 patients affected with several kinds of dyskinetic syndromes.VL and CM nucleus of the thalamus and dentate nucleus of the cerebellum were the subcortical structures destroyed In 19 cases "good" results were obtained, in 12 cases "moderate", and in 8 cases "poor" results.The authors briefly discuss indications and results of the stereotaxic operation. ZusammenfassungDie Autoren berichten über ihre Erfahrungen bei 39 stereotaktischen Operationen, die bei einer Gruppe von 31 Patienten durchgeführt wurden wegen dyskinetischer Syndrome. Die Nucleii VL und CM des Thalamus und der Nucleus dentatus wurden zerstört. In 19 Fällen wurden gute Resultate erreicht, in 12 Fällen mäßige und in 8 Fällen geringe verspürr.Die Autoren besprechen kurz die Indikationen und Ergebnisse der stereotaktischen Eingriffe.