Abstract
1. In 72% of non-anaesthetized spinal cats, single volleys ascending from the sacral cord evoke long-lasting primary afferent depolarization in L7 segment. It occurs in the central terminals of cutaneous but not in Ia muscle afferents. 2. Volleys descending to L7 segment evoke only short-lasting presynaptic depolarization. 3. It is concluded that presynaptic inhibition in L7 segment produced by ascending volleys is more effective than that evoked by descending volleys.
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