Subnasale: the point under the nose in facial analysis
Quick facts
- Definition
- A midline point where the base of the columella meets the upper lip.
- Also called
- Subnasion, point sn.
- Role in the face
- Start of the lower third and vertex of the nasolabial angle.
- Clinical use
- Reference for measuring the upper lip, the philtrum and lip projection.
- Caution
- Needs a level head and lips at rest for a reliable reading.
The subnasale, or subnasion, is the midline reference point where the base of the columella joins the upper lip. It is the point where, in profile, the nose ends and the lip skin begins, which is why it appears so often in facial analyses, especially those of the lower third of the face.
Where does it fit in the measurements of the face?
The subnasale is the upper limit of the lower third: from subnasale to chin. It is also the vertex of the nasolabial angle, formed between the columella and the upper lip. From it we measure the length of the upper lip (subnasale to stomion) and the relationship with the chin.
| Measurement | Points involved | What it is for |
|---|---|---|
| Nasolabial angle | Columella, subnasale, upper lip | Tip rotation and lip projection |
| Upper lip height | Subnasale and stomion | Lip proportion and tooth display |
| Lower third | Subnasale and chin | Vertical proportion of the face |
| Subnasale-pogonion line | Subnasale and pogonion | Relationship of lips and chin in profile |
Why does it matter in lip planning?
The length of the upper lip, the angle of the base of the nose and the support of the philtrum are all read from the subnasale. A concern such as "my lip disappeared" may be linked to a loss of support in this region, and not only to the vermilion. At the same time, a long upper lip and a low nasal tip change what can be expected from any approach, and talking about this avoids unrealistic expectations.
The subnasale and risk
The subnasal region lies close to vascular structures at the base of the nose and the upper lip, described in columellar artery and in the labial branches of the facial artery. This reinforces that any approach in this area requires anatomical knowledge, hyaluronic acid with hyaluronidase on hand and attention to signs of vascular compromise. The management is up to the qualified professional, according to the rules of their professional board.
In Harmy
The app works with the front photo. The Lips point of the marking guides the conversation about lip volume, but Harmy does not measure the subnasale or profile angles: the projection uses only the front photo, and profile measurements depend on another assessment.
Also called: subnasion, subnasal point (sn).
Frequently asked questions
Are subnasale and subnasion the same point?
Yes. They are two spellings for the same reference point: the meeting point between the base of the nose (columella) and the upper lip, on the midline.