|
| | Definition |
|
| Landmarks | |
| ANS | Anterior nasal spine, the tip of the median, sharp bony process of the maxilla |
| PM | Pterygomaxillary, the intersection between the nasal floor and the posterior contour of the maxilla [29] |
| UPW | Upper pharyngeal wall, point of intersection of the line NL to the posterior pharyngeal wall |
| MPW | Middle pharyngeal wall, intersection of the perpendicular line from U to the posterior pharyngeal wall |
| LPW | Lower pharyngeal wall, intersection of the perpendicular line from V to the posterior pharyngeal wall |
| U | Uvula, the tip of the uvula |
| V | Vallecula, the intersection of the epiglottis and the base of the tongue |
| S | Center of the sella turcica |
| N | Nasion, the deepest point in the concavity of nasofrontal suture |
| A | A point, the deepest point in the concavity of the anterior maxilla between the anterior nasal spine and the alveolar crest |
| B | B point, the deepest point in the concavity of the anterior mandible between the alveolar crest and the pogonion |
| Gn | Gnathion, the most anteroinferior point on the bony chin |
| Me | Mention, the most inferior point on the body chin |
| Ar | The intersection of the posterior border of the ramus with inferior surface of the cranial base |
| GOI | Gonial intersection, the intersection of the mandibular plane with a plane through Ar, posterior and along the portion of the mandibular ramus inferior to it [30] |
| NL | Nasal line, line joining the ANS and PM |
| MnPl | Mandibular plane, line joining Me and GOI |
| Measurements | |
| PM-UPW (mm) | Depth of the nasopharyngeal airway space from PM to UPW |
| U-MPW (mm) | Depth of the oropharyngeal airway space from U to MPW |
| PASmin (mm) | Shortest distance between the base of the tongue and the posterior pharyngeal wall, the narrowest sagittal airway space |
| V-LPW (mm) | Depth of the hypopharyngeal airway space from V to LPW |
| SNA (°) | Angle between the S-N line and the N-A line |
| SNB (°) | Angle between the S-N line and the N-B line |
| ANB (°) | Angle between the N-A line and the N-B line |
| MnPl/SN (°) | Mandibular plane angle, the angle between the MnPl and the S-N line |
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