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Anterior boundary: line connecting the anterior nasal spine (ANS) and the apex of the nasal bone; posterior boundary: line extending from sella (S) to posterior nasal spine (PNS); superior boundary: line connecting basion or the highest point on the nasal bone 1 mm inferior to the edge of the field of view and S; and inferior boundary: line extending from ANS to PNS.
Angle INC x PNS x GPF--measure the angular position of the GPF, in relation to the median sagital plan of the hard palate, having as the reference point, the posterior nasal spine.
Posterior nasal spine (PNS) -- Tip of###Palatal plane Line (NL) -- extending

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