An experimental study of the F wave in the baboon.

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Abstract
Action potentials were recorded from the thenar and hypothenar muscles with intramuscular electrodes on stimulation of the median and ulnar nerves at the wrist and elbow in 4 adult baboons. The forelimb had been completely deafferented by surgical excision extradurally of the dorsal roots of the branchial plexus. In all the animals, late waves following the direct response, or M wave, wererecordedfrom the small muscles of the hand. These late waves had the characteristic features of F waves and it was concluded that they result from antidromic activation of motor neurones in the spinal cord.