Electrical interaction between motoneurons and afferent terminals in cat spinal cord.

1. The electrical threshold of the terminations of single group Ia and II afferent fibers was transiently reduced by the antidromic discharge of the initial segment of spinal motoneurons in the cat. 2. This depolarization of the terminals of afferent fibers known to synapse on motoneurons confirms previous observations of antidromic electrical interaction between these structures.