THE ELECTRIC RESPONSES OF THE FACIAL MUSCLES

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Abstract
Exps. were made on cats. Single shocks applied to the facial nerve elicit complex effects in which many spikes of different latencies are visible. The effects of repetitive stimulation, of varying the intensity of the stimuli and of curare lead to the conclusion that the complex records obtained are due to temporal dispersion. The variable latencies of different fibers in a muscle are mainly due to variable neuromuscular delays. Several theories of the neuromuscular delay are discussed. It is concluded that the most acceptable explanation is that the delay is due to the time necessary for the liberation of acetylcholine[long dash]the chemical transmitter of the motor-nerve impulses.

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