Figure 21: Position 2 – a – oF = level of the upper epiglottis edge, view over larynx and dorsal pharynx; b – position 2 – oF = Valsalva maneuver; c – position 3 – oF = anterograde view above the interarytenoid region; d – position 3 – oF = retrograde view above the interarytenoid region.