Fig. 4. Activity recorded from the recurrent nerve (RN) paired with alternating contractions of the buccal constrictor (BC) and posterior esophageal constrictor (pEC) muscle groups. (A) Recordings of muscle movement and nerve activity from an intermolt 5th instar larva. (B) Muscle movement and nerve activity recorded from an early-molt larva (0–16 h after head capsule slippage). Although the foregut contractions of the early-molt larva are of low amplitude, the RN shows its characteristic bursting activity and the foregut muscle contracts in a pattern similar to the 5th instar peristalsis. Scale bars, 50 µm and 3 s.

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