The alar part of nasalis dilates the nostril, opposing the compressor/transverse part. Together they form the full nasalis muscle. The alar part is the same as the dilator naris in some nomenclature systems.
| Origin | Maxilla — over the canine tooth root |
|---|---|
| Insertion | Lateral crus of the lower lateral cartilage |
| Nerve Supply | Facial nerve — buccal branch (VII) |
| Blood Supply | Lateral nasal artery |
| Actions | Dilates the nostril — raises the alar rim; The dilator component of nasalis |
|---|
In nasal fracture repair, the nasal musculature including the alar part is elevated from the bone during open reduction. Alar part reattachment after rhinoplasty affects nostril shape and competency.
Active during forced nasal breathing — the nostril flares with alar part contraction.
Incorrectly repositioned alar part nasalis after open rhinoplasty producing asymmetric nostril flare requiring revision surgery.
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