Canine fossa: the maxillary depression below the infraorbital
Quick facts
- Definition
- Depression on the anterior surface of the maxilla, below the infraorbital foramen and beside the root of the canine.
- Nearby structures
- Infraorbital nerve and vessels, which exit just above.
- Muscle of origin
- Levator anguli oris, which arises in the fossa.
- Relevance
- Contributes to the depth of the midface and of the nasolabial fold.
- Caution
- Deep region, with relevant nerves and vessels.
The canine fossa is a depression on the anterior surface of the maxilla, located below the infraorbital foramen and beside the root of the canine tooth. It houses the origin of lip muscles and lies close to important structures. For orofacial harmonization, it is a landmark of the midface.
What is in and around the canine fossa?
| Structure | Note |
|---|---|
| Levator anguli oris muscle | Arises in the canine fossa and lifts the corner of the mouth |
| Infraorbital nerve | Exits through the foramen, just above, and supplies sensation to the cheek, upper lip and side of the nose |
| Infraorbital vessels | Accompany the nerve |
| Piriform aperture | Beside it, at the base of the nose |
The infraorbital foramen lies in the infraorbital canal, and its exact position varies between people.
Why does it matter for the nasolabial fold?
With age, the bone of the maxilla recedes and the fossa tends to deepen, together with the premaxilla and the piriform aperture. This recession reduces midface support and contributes to the look of a deeper nasolabial fold. That is why assessment of the fold also considers the bone, not just the skin and fat.
How to explain it to the patient?
See also nasolabial fold filler for a refresher.
In Harmy
The Nasolabial Fold point simulates ml and intensity in the area on the frontal photo. The projection is illustrative and does not represent the bone or the canine fossa.
Also known as: maxillary fossa.
Frequently asked questions
Where is the canine fossa?
On the anterior surface of the maxilla, below the infraorbital foramen and lateral to the nasal opening, at the level of the root of the canine tooth. It is a bony depression.
Why does the canine fossa matter in facial harmonization?
Because its deepening over a lifetime contributes to the look of lost midface support and to the depth of the nasolabial fold. Important nerves and vessels pass nearby.