Landmarks of Cephalometric X-ray. Abbreviations of fig. 2: PNS: Posterior nasal spine, ANS: Anterior nasal spine, S: Sella, N: nasion, A: A-point, B: B-point, GO: Gonion, GN: Gnathion, Me: Menton, Po: Porion, Or: Orbitale, CO: condylion FH: Frankfort horizontal plane, PP: Palatal plane, MP: Mandibular plane, OP: Occlusal