Fig. 3. Synaptic responses elicited by both the opener inhibitor (OI) and the common inhibitor (CI) can be detected in many regions of the dactyl opener muscle. Intracellular recordings from different areas of the muscle (labeled A–D) are shown. In each case, CI was stimulated before OI. Scale bars for electrophysiological recordings, 2.5 mV, 0.5 s. Scale bar for photo, 0.25 cm.