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Fig. 1 | BMC Oral Health

Fig. 1

From: Quantification of pharyngeal airway space changes after two-jaw orthognathic surgery in skeletal class III patients

Fig. 1

Partition of the upper airway. The airway levels are parallel to the Frankfort horizontal (FH) plane. The CV1, CV2, and CV4 planes are parallel to the FH plane through the most inferior point of each corresponding cervical vertebra. Na-perpendicular plane is the midsagittal plane passing through Na and perpendicular to the FH. PNS: Posterior nasal spine; Vp: The most posterior part of the ala of vomer; Nasopharynx: Region between PNS-Vp and CV1; Oropharynx: Region between CV1 and CV2; Velopharynx: Region between CV2 and CV4

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BMC Oral Health

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