Fig. 10. Typical action potentials recorded by suction electrodes from nerve (A) and muscle (B) in a nerve-iliofibularis muscle preparation. All recordings shown are the average of eight action potentials. (A) Nerve action potentials were recorded by a bipolar lead from the nerve innervating the muscle at 4°C at the resting muscle length (thin line) and at the stretched length by 7.7% above resting length (thick line). Both lines are almost superimposed and cannot be distinguished. (B) Muscle action potentials were recorded by a monopolar lead from the surface of the muscle at 4°C at the resting muscle length (thin line) and at the stretched length (7.7% above resting length; thick line). The artifact from electrical stimulation was superimposed at the beginning of the recordings in A.