Placed on the soft-tissue profile
Soft-tissue nasion sits a few millimeters anterior over the same notch. The bony suture is the one the cranial base is built on.
Point · N
Nasion (N)
The frontonasal suture: where the frontal bone meets the nasal bone at the bridge of the nose.
At Beginner a placement counts as found within 2.2 mm of the reviewed reading.
How to find it
Press a step to be shown it on the ceph.
Common errors
Each figure is the reviewed reading of Nasion (N) and a typical miss, on the same ceph, at the distance the mistake usually goes.
Placed high, on the glabella side
The frontal outline is long and featureless above the notch, so the point creeps up it.
Used in
24 measurements are built on it. Miss it, and every one of them moves.
- SNA angle
- SNB angle
- ANB angle
- Anterior cranial base length (S–N)
- Upper gonial angle (Ar-Go-N)
- Lower gonial angle (N-Go-Gn)
- U1 to N–A (angle)
- U1 to N–A (mm)
- L1 to N–B (angle)
- L1 to N–B (mm)
- Pogonion to N–B (mm)
- Facial angle (Downs)
- Facial depth (Ricketts)
- Angle of convexity (N-A-Pog)
- A-B plane angle
- SN to mandibular plane (SN-GoGn)
- SN to occlusal plane
- Convexity of A point (mm)
- A point to Nasion-perpendicular
- Pogonion to Nasion-perpendicular
- Saddle angle (N-S-Ar)
- Björk's sum of angles
- Anterior cranial base (N–S) — Jarabak
- Posterior:anterior face height ratio (S-Go : N-Me)
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