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. 2021 Jan-Mar;14(Spec 1):16–24. doi: 10.5935/1984-0063.20200072

Appendix I. Definition of cephalometric reference planes.

Reference Planes
NF - Nasal floor; a line connecting anterior nasal spine (ANS) and posterior nasal spine (PNS).
OP - Occlusal plane; a line connecting Mc and the incisal tip of the most prominent maxillary incisor (is).
MP - Mandibular plane; line tangent to the lower border of the body of the  mandible through menton (Go-Me).
Base of C2 (2nd cervical vertebrae) – a line connecting aC2 and pC2.
Base of C3 (3rd cervical vertebrae) – a line connecting aC3 and pC3.