Neuronal spike-trains were recorded extracellularly within the preoptic area, which is generally considered the center of information processing for thermoregulation. The neuronal responses were tested by thermal stimulation of the scrotal and abdominal skin of the rat. After a neuron had been identified as warm responsive, electrical stimulation and/or lesion were applied in medial midbrain to test the influence on the preoptic neurons. Post-stimulus-histograms were determined by using 600 single shocks. Furthermore a small area of the medial midbrain was electrolytically lesioned and the thermal response of the neuron was tested again. All lesion, stimulation and recording sites were examined histologically. Electrical stimulation of either nucleus raphe dorsalis or centralis influenced the responsiveness of the recorded preoptic neurons. The post-stimulus-histograms predominantly reveal polysynaptic ascending pathways. Lesion of either nucleus raphe dorsalis or centralis abolished the responsiveness of the recorded preoptic neurons. Lesions lateral to these nuclei were ineffective. By this it is concluded that both nucleus raphe dorsalis and centralis are essentially involved in the thermal signal transmission to the preoptic area.
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