Fig. 5. Methylene blue staining reveals three axons in the nerve innervating the dactyl opener. Left and right photos were obtained from sites located 25% and 75%, respectively, along the length of the entire proximal–distal axis of the dactyl opener muscle. Proximal is at the top of each photo. Arrows show a small-diameter axon that branches (as do two large diameter axons) distally to supply branches of the nerve. Scale bars, 50 µm.