[Impulse flow structure following exposure of a cutaneous nerve to nociceptive solutions of potassium chloride].

Using the cross-correlation method, the pattern of impulses flow coding a nociceptive signal is studied in the n. saphenus of the cat. It is found that nociceptive solutions of KCl (125-1000 mM) stimulate both myelinated and nonmyelinated fibres. The flow density increases with time of the stimulation action, reaching a level sufficient for the appearance of nociceptive pressure reflexes. The maximum of these reflexes coincides with the appearance of synchronous pulsations in the group of non-myelinated fibres. Thus a nociceptive signal caused directly by the exposure of the nerve to strong solutions of KCl is coded by a high density of the impulse flow, in which synchronous pulsations are likely to be found.