Fig. 4. (A) Simultaneous extracellular recordings from an abdomen wall muscle (Ab) and a frontal connective (FC) in a fully intact preparation, exhibiting full synchrony between the ventilation and the frontal ganglion (FG) patterns. (B) Uncoupling of the ventilation and FG patterns after the thoracic ventral nerve cord has been cut between the pro- and mesothoracic ganglia. The trace shown in Bi, precedes the one shown in Bii, demonstrating an independent FG rhythm after only a few minutes.