Vagus fibers in the motor arc of the inflammatory reflex. Electrical stimulation of the cervical vagus nerve was performed using a cuff-mounted bipolar stimulating electrode. (A) (top) cuff electrode (bottom) pulse waveform. PA: pulse amplitude; PW: pulse width (200 to 250 µs); IPI: interpulse interval (50 µs). (B,C) Evoked potentials were measured at the subdiaphragmatic vagus nerve in rats. Evoked potentials are plotted against (B) time and (C) velocity (n = 4).