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. 2013 Jan 11;83(4):623–629. doi: 10.2319/083112-700.1

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© 2013 by The EH Angle Education and Research Foundation, Inc.

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Figure 2. — Volumetric measurements of pharyngeal airway space. (A) Reference planes: A, posterior nasal spine (PNS) plane (axial plane passing through PNS); B, soft palate plane (axial plane passing through most inferior point of soft palate); and C, epiglottis plane (axial plane passing through base of epiglottis on anterior pharyngeal wall). (B) ‘a’ indicates the naso-pharyngeal airway; ‘b’ indicates the oro-pharyngeal airway; and; ‘c’ indicates the hypo-pharyngeal airway. The red arrows indicating the borders were planes through the PNS and the most inferior point of the soft palate parallel to the Frankfort Horizontal plane.