Within the target area used for the stereotactic treatment of pathological tremor, recording of somatosensory evoked potentials and single units and also electrical stimulation were performed. The data were correlated with anatomical sites as demonstrated in the stereotactic atlas of Schaltenbrand and Wahren by using a computer system. The affected anatomical area was predominantly the prelemniscal radiation and adjacent thalamic nuclei. The recordings and stimulation effects indicate that a direct spinal input is involved in the control of muscle tone and manifestation of tremor.
An application of computer graphics technology to functional stereotactic neurosurgery is presented. Neuroanatomical images derived from a stereotactic atlas and information retrieved from a neurophysiological data base are drawn on a graphic monitor. The pictures are oriented and scaled according to appropriate landmarks. The aim of this work ist to add confidence in the surgeon’s selection of the probe trajectory and to improve the knowledge of sensory and motor organization within the thalamus.
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