Abstract
In the evoked electromyogram taken with surface electrodes, the onset of the tonic activity was marked by the notch which appeared a few msec later than the onset of the compound action potential. The action potentials were recorded from the M. abd. digiti V in response to the ulnar nerve stimulation in man at the axilla, elbow and wrist. The average conduction velocity of the tonic motor fibers was calculated to be 33 m per see, while that of the kinetic fibers was 58m per see.
