Peripheral Influences on VPM-VPL Thalamic Nuclei in the Human A Study on Evoked Potentials

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.

Stereotaxic surgery for non Parkinsonian Dyskinesias

“…The thalamic evoked potential (TEP) in the ventrobasal complex (VPL-VPM) is one of the routine criteria used for localization during stereotaxic operation (4,5,14).…”

Sensory processing of deep tissue nociception in the rat spinal cord and thalamic ventrobasal complex

“…Phenotypic alterations in coding of neurons of the ventroposterolateral and ventroposteromedial nuclei of the ventrobasal complex to somatic stimulation following tissue injury or spinal disinhibition has been previously reported to demonstrate the sensitization and plasticity of thalamic neurons in pathological conditions (Sherman et al 1997;Kim et al 2007;Patel and Dickenson 2016). However, potential changes in the coding of VBC neurons to somatosensory and visceral inputs following muscle trauma remain unknown (Mallart 1968;De Divitiis et al 1971;Ohara et al 2004).…”

“…However, potential changes in the coding of VBC neurons to somatosensory and visceral inputs following muscle trauma remain unknown (Mallart ; De Divitiis et al. ; Ohara et al. ).…”