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. 2011 Feb 7;81(3):460–468. doi: 10.2319/091910-545.1

Figure 1.

Figure 1

Landmarks and reference lines used for orofacial airway space: Pt (pterygoid point), the posterior point of the pterygopalatine fossa; ANS (anterior nasal spine), anterior point of the maxilla; PNS (posterior nasal spine), posterior point of the palatine bone; Me (Menton), the inferior point of the symphysis; H1, intersection between the posterior border of the tongue and the hyoid bone; H2, the most anterior point of the hyoid bone; T, the most anterior point of the outline of the tongue; palatal plane, a line passing through the ANS and PNS.