Fig. 1. Lateral radiograph of the head and neck taken at the best laryngoscopic view with a No. 3 Macintosh curved blade (MCB) (  solid arrow ). Larynx visualization space from C5 to MCB tip marked. Mentovertebral distance (  dotted arrow ) from C5 to mentum to measure anterior displacement of the jaw during laryngoscopy. C = cervical vertebrae; Cr = cricoid cartilage; H = hyoid body. 

Fig. 1. Lateral radiograph of the head and neck taken at the best laryngoscopic view with a No. 3 Macintosh curved blade (MCB) (  solid arrow ). Larynx visualization space from C5 to MCB tip marked. Mentovertebral distance (  dotted arrow ) from C5 to mentum to measure anterior displacement of the jaw during laryngoscopy. C = cervical vertebrae; Cr = cricoid cartilage; H = hyoid body. 

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