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Reviewed July 13, 2026
What is lower gonial angle?
The lower gonial angle is the bottom half of the jaw-corner angle. In Jarabak analysis, a line from gonion to nasion splits the full gonial angle into an upper and a lower part, and the lower part, measured from nasion through gonion to the chin, tracks how the body of the jaw is set.
How It's Measured
How is the lower gonial angle measured?
The lower gonial angle is read on a side view. You take the full gonial angle at the jaw corner, then divide it with a line from gonion up to nasion. The portion below that line, nasion through gonion to menton, is the lower gonial angle (Jarabak norms, Nanda et al.).
- Gonion (Go): the most backward and downward point of the jaw corner, where the ramus meets the body of the mandible.
- Nasion (N): the deepest point of the bridge of the nose, used as the dividing landmark in Jarabak analysis.
- Menton (Me): the lowest midline point of the chin, which closes off the lower part of the angle.
The lower gonial angle reflects the anterior, body portion of the jaw, while the upper part reflects the ramus. Together they make up the total gonial angle (Naini, 2011).
Sharpening the jaw squares off the corner behind the ear. The lower gonial angle tightens from 72.7° to 69.8° on the same face, same lighting, same framing.
Why It Matters
Why does the lower gonial angle matter?
The gonial angle is one of the clearest readouts of how the jaw grew. A large, obtuse angle goes with a vertical growth pattern and a jaw that rotated down and back, lengthening the lower face; a small, acute angle goes with horizontal growth and a shorter, squarer jaw (Naini, 2011). Splitting it into upper and lower halves lets clinicians see whether that growth sits in the ramus or in the body of the jaw (Diagnostic cephalometrics, 2022).
There is an important naming trap here. When people talk about a high or low gonial angle in the context of a sharp jawline, they almost always mean the full jaw-corner angle, not this Jarabak sub-angle. The lower gonial angle is a diagnostic slice of it, not the visible jaw corner itself.
The angle also carries sex information. Women tend toward a wider gonial angle with a narrower bigonial width, while men run the other way (Digital mandibular assessment, 2024). That is one reason a single ideal number misleads. The cards and table below give working values, but read them against the whole jaw and the rest of the face.
~70°
Men
~75°
Women
70°–75°
Typical Range
Approximate lower gonial angle (Nasion-Gonion-Menton) by the Jarabak convention. Women tend toward a slightly wider gonial angle than men. These are textbook norms; the value moves with jaw growth pattern.
Facial Types
Gonial Angle by Growth Pattern
The gonial angle is usually read against jaw growth pattern rather than ethnicity, since it tracks how the mandible rotated during growth. Each row links to the source.
Type / group | Gonial angle tendency | Source |
|---|---|---|
Hyperdivergent (high angle) | Obtuse, wide angle; vertical growth, longer lower face | |
Hypodivergent (low angle) | Acute, reduced angle; horizontal growth, short square jaw | |
Vertical skeletal dysplasia | Angle used alongside SN-GoGn and the Jarabak ratio to flag vertical growers | |
Women vs men | Wider gonial angle, narrower bigonial width in women | |
Population norms | Cephalometric norms are population-specific and differ from Caucasian standards |
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Your Questions
Frequently Asked Questions
It is the lower half of the total gonial angle. In Jarabak analysis, a line from gonion to nasion divides the jaw-corner angle in two; the part below that line, nasion through gonion to menton, is the lower gonial angle and sits around 70 to 75 degrees (Bjork-Jarabak norms).
Most references to the gonial angle mean the full jaw-corner angle, articulare through gonion to menton, which runs about 120 to 130 degrees. The lower gonial angle is only the sub-portion below the gonion to nasion line, so a high gonial angle in the popular sense is about the total angle, not this slice (Naini, 2011).
A high, obtuse angle goes with a vertical growth pattern, a jaw rotated down and back, and a longer lower face. A low, acute angle goes with horizontal growth and a shorter, squarer jaw. Clinicians read it alongside other vertical measures to classify growth (Diagnostic cephalometrics, 2022).
Yes. Studies find women tend toward a wider gonial angle with a narrower bigonial width, while men show the opposite pattern, which is part of why a squarer, more defined jaw corner reads as more masculine (Mandibular assessment, 2024).