Afferent activity in fine myelinated and unmyelinated nerve fibers of a cutaneous nerve upon mechanical stimulation of cutaneous receptors]

The activity in fine myelinated and nonmyelinated nerve fibres of a cat cutaneous nerve was analyzed using a collision method and method improving the signal-to-noise ratio in the antidromic action potential neurogram. On the basis of the investigation of conduction velocities, electrical excitation thresholds and responses to mechanical stimulations, the following groupsare distinguished among fine myelinated and nonmyelinated fibres: group A delta1 (30-14m/s) activated mostly under light mechanical stimulation; group A delta2 (14.4.0 m/s) more readily activated by intense mechanical stimulation; group of "mixed" fibres containing myelinated and nonmyelinated nerve fibres (4-2 m/s) activated under both kinds of mechanical stimulation; group C1 (2.0-1.0 M/S) ACTIVATED MOSTLY BY LIGHT Mechanical stimulation and group C2 (1.0-0.15 M/S) CONNECTED WITh receptors that require for excitation intense mechanical stimulation.