Cephalometric Landmarks — MFDS Part 1 MCQ
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Correct answer: A — The most anterior point of the frontonasal suture
Nasion (N) is the most anterior point of the frontonasal, or nasofrontal, suture on a lateral cephalometric tracing. It forms part of the anterior cranial-base reference and is used in measurements such as the Sella–Nasion line and SNA, SNB and ANB angles. Option D describes Sella (S), conventionally located at the centre of the sella turcica. Option B describes Pogonion (Pog), the most anterior point of the bony chin. Option C describes Menton (Me), the most inferior point of the mandibular symphysis. Option E describes Porion (Po), the most superior point of the external auditory meatus.
Reference: D'Antò V et al. Morphologic predictors of mandibular changes induced by Sander's Bite Jumping Appliance. Orthodontics & Craniofacial Research. 2025;28(1):67–74. Cephalometric landmark definitions. https://pubmed.ncbi.nlm.nih.gov/39180251/