Fig. 2. Lateral radiograph of the head and neck taken at the best laryngoscopic view with the No. 2 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.