INDEPENDENCE OF CONDUCTION VELOCITY AMONG MYELINATED FIBERS IN CAT NERVE

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Abstract
Interactions between myelinated fibers in cat sural nerve in vivo were investigated by comparing the conduction velocities of single sural units, isolated in dorsal root filaments, when activated alone (conduction from dorsal root to sural nerve) and when activated together with neighboring fibers (conduction from nerve to root). A study of 71 units, representing sural fibers 5 to 15 [mu] in diameter, failed to indicate differences in conduction velocity not attributable to small errors inherent in the procedure. Other experiments, including study of effects on a given unit of volleys in an adjacent large nerve and investigation of effects of activity in fibers of the same nerve larger than the test unit, also failed to indicate significant interactions. Veratrine (2 mg/kg) did not influence the results of the tests described.

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