Fig. 2From: Comparison of diffusion ranges at different local anesthetic volumes during superior laryngeal nerve blockComparison of the vertical and horizontal diameters (mm) of the blue dye deposition region of the thyrohyoid membrane among different dose groups. *P < 0.05 compared with the 2 mL group; #P < 0.05 compared with the 3 mL group; ΔP < 0.05 compared with the 4 mL groupBack to article page