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U1 to Palatal plane angle: It is the inferior inside angle formed between the long axis of the upper incisors and palatal plane (formed by line joining the anterior nasal spine and posterior nasal spine)
c) Hipopharynx: its upper limit is the oropharynx lower limit and its lower limit is a line starting at the most inferior and medial point of the third cervical vertebra until the downward projection of the Posterior Nasal Spine (between line 6 and 1-2 from Fig.
Cross-sectional area was measured in eleven coronal levels, and nasal cavity volume was evaluated from anterior nasal spine to posterior nasal spine. The thickness of soft tissue in oral pharynx region was also measured.

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