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Nasopharyngeal airway space: formed by palatal plane and the Pt-PNS posterior nasopharyngeal line. Palate-tongue space: space between tongue and palate from the line perpendicular to the palatal plane at the incisive foramen to the line perpendicular to the palatal plane at the PNS. Tongue space: area formed by superior and posterior borders of the tongue and T, Me, H1, and H2.
