Fig. 1From: Comparison between ultrasound-guided and anatomical landmark-guided block of internal branch of the superior laryngeal nerve for awake fiber-optic intubation in suspected difficult intubation: a randomized controlled studyThe hyoid bone and thyroid cartilage were marked in the ultrasound image. The red dotted line and yellow circle represented the thyrohyoid membrane and superior laryngeal nerve place, respectively. The white arrow represented the needle pathBack to article page