| Abstract: | Recording focal evoked potentials showed that the second somatosensory region of the cat thalamus is located in the posterolateral part of the ventral posteromedial nucleus. The zone of representation of the hindlimb lies somewhat laterally, posteriorly, and superiorly to the zone of the forelimb. The zone of representation of the mouth lies more medially still. Latent periods of responses arising in both regions of the thalamus to cutaneous stimulation of the contralateral limbs are about equal. Neurons of the second somatosensory region of the thalamus send projections to cortical area S2. It can be concluded from the results that formation of the structure of double representation of the somatosensory systems in the cat is completed at the thalamic level. |
