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. 2010 Jun 7;588(Pt 15):2707–2729. doi: 10.1113/jphysiol.2010.192518

Figure 2. Cycle-to-cycle variability in expiratory discharges.

Figure 2

A, efferent discharges in the T6 external and the T9 internal intercostal nerves at three different times during one experiment with urethane anaesthesia: a, 9 h; b, 10.5 h; c, 13 h after induction. B, demonstration that intermittent expiratory efferent discharges represent a pattern of events in the medulla (ketamine/xylazine-anaesthetized rat): recordings from an EBSN (middle trace), its instantaneous frequency (top trace) and the T6 external intercostal nerve (bottom trace). Expiratory (Exp) and inspiratory (Insp) bursts indicated. Time calibration applies to both panels.