Abstract
Patterns of inhibitory and excitatory convergence were investigated for 70 group I activated cells in the main cuneate nucleus (MCN) (34 identified cuneo-thalamic relay cells) and 102 group I activated cells in the external cuneate nucleus (ECN), using natural stimulation of stretch receptors in various wrist muscles. MCN cells as well as ECN cells showed a high degree of spatial specificity. Most of the cells were activated by receptors in one wrist muscle only. A few cells were activated from a couple of adjacent synergists. Inhibitory effects were rarely produced in group I activated MCN cells, but were common among the ECN cells (40%). Many different combinations of excitation and inhibition from the various wrist muscles were found for ECN cells. There was no particular tendency of reciprocal effects from antagonistic muscles.
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