Fig. 2. FG motor output in vivo can be correlated to foregut movement and to specific gut dilators. (A) Extracellular recording from the recurrent nerve (RN) and the simultaneous output of a force transducer (FT) connected to the esophagus wall in a fully intact locust. (B) Simultaneous extracellular recordings from the posterior pharyngeal nerve (PPN), and from the third dorsal dilator of the pharynx (37) in vivo. Inset on left shows 5 overlaid sweeps triggered by the large unit in the PPN trace, demonstrating 1:1 relationship between this unit and the muscle activity.