Key result
Stimulation of the ulnar nerve at the wrist produces an F wave, supporting the theory that it results from antidromic activation of motor neurones.
This preclinical study investigates the physiological origin of the F wave following ulnar nerve stimulation in baboons.
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Antidromic motor neuron activation explains F waves; leaves open refined diagnostic thresholds in neuropathy.
that when the ulnar nerve is stimulated at the wrist and the muscle action potential recorded from the hypothenar muscles, the direct response or M wave is followed by a small deflection, the F wave. These authors considered that the F wave was a reflex response due to stimulation of afferent fibres in the peripheral nerve, but Dawson and Merton (1956) produced evidence that it resulted from the discharge of motor neurones in the spinal cord following their antidromic activation by centripetal volleys. Addi-tional evidence for this view has recently been pro-vided by Thorne (1965). Gassel and Wiesendanger (1965) found a wave with certain characteristics of the F wave in the deafferented foot muscles of cats, and concluded that antidromic activation of motor
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McLeod et al. (1966) studied F wave physiology. Ulnar nerve stimulation was evaluated on F wave response. Stimulation of the ulnar nerve at the wrist produces an F wave, supporting the theory that it results from antidromic activation of motor neurones.
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