Placed at the crossing of the two lines
The lines meet outside the bone. Gonion is on the outline, where the bisector cuts it.
Point · Go
Gonion (Go)
The corner of the jaw: the most posteroinferior point of the mandibular angle.
At Beginner a placement counts as found within 3.6 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 Gonion (Go) and a typical miss, on the same ceph, at the distance the mistake usually goes.
Placed on the antegonial notch
The notch just forward of the angle is a real feature and the corner is not; the point slides forward into it.
Used in
15 measurements are built on it. Miss it, and every one of them moves.
- Gonial angle (Ar-Go-Gn)
- Gonial angle (Ar-Go-Gn) — Jarabak
- Upper gonial angle (Ar-Go-N)
- Lower gonial angle (N-Go-Gn)
- IMPA — lower incisor to mandibular plane
- IMPA — lower incisor to mandibular plane (Tweed)
- FMA — Frankfort-mandibular plane angle
- Mandibular plane angle (Downs)
- Mandibular plane angle (FH ∠ Go–Gn)
- SN to mandibular plane (SN-GoGn)
- Articular angle (S-Ar-Go)
- Björk's sum of angles
- Ramus height (Ar–Go)
- Mandibular body length (Go–Gn)
- Posterior:anterior face height ratio (S-Go : N-Me)
Your record
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