Fig. 3From: Comparison of diffusion ranges at different local anesthetic volumes during superior laryngeal nerve blockGraph exhibiting the mean interface distances from the iSLN to adjacent structures (n = 40). D1: Distances between iSLN and hyoid, D2: Distances between iSLN and thyroid cartilage, D3: Distances between iSLN and the anterior midline of the neck, D4: The vertical distances from the skin surface. The prefix “u” represents ultrasound-guided measurementBack to article page