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[Depolarization of primary forelimb afferents in the cat. Evoked activation of sensory nerves of the neck].

Primary afferent depolarization in the brachial enlargement evoked by neck afferent excitation was studied in nembutal-anesthetized cats. The highest level of the depolarization was observed in low-threshold muscle and high-threshold cutaneous afferents. Simultaneously with this depolarization there occurs a long-lasting depression (more than 0.5 s) of flexor reflex. It is suggested that such influences upon primary afferents are transmitted through pathways descending within dorsal and lateral funiculi. The obtained data are discussed with respect to the functioning of the postural mechanisms.