Zygomaticus major is the primary smile muscle. Its oblique direction from the zygomatic arch to the modiolus creates the nasolabial fold and dimple in individuals with an accessory bundle.
An expanded entry for Zygomaticus Major.
| Origin | Zygomatic bone, lateral surface, zygomatic arch area |
|---|---|
| Insertion | Modiolus at the corner of the mouth |
| Nerve Supply | Facial nerve, zygomatic and buccal branches (VII) |
| Blood Supply | Facial artery |
| Actions |
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|---|
It draws the corner of the mouth upward and outward, producing a smile.
Zygomaticus major is the most commonly replicated muscle in smile reanimation surgery. Temporalis transfer and gracilis free muscle transfer aim to replicate its vector from zygomatic arch to modiolus.
Palpated along the cheek during smiling, the prominent diagonal cord.
Gracilis transfer positioned to replicate the zygomaticus major pull direction, restoring dynamic smile symmetry.
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