Fig. 7. Simultaneous extracellular recordings from an abdominal wall muscle (Ab) and frontal ganglion (FG) efferent nerves at three different stages of the moult. (A) The old cuticle is split. (B) The head, thorax and pro- and mesothoracic legs emerge. (C) Expansion of the wings. (D) Variation in cycle periods and squeeze duration (first long, high frequency burst in each cycle) in the different moult-related behaviours. The ventilation and the FG patterns are fully synchronized throughout these different stages of the moult. Values are means ± S.D. MPN, median pharyngeal nerve; PPN, posterior pharyngeal nerve; FC, frontal connectives; RN, recurrent nerve.