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.
| 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 | Pulls the corner of the mouth superolaterally — the primary smile muscle; Produces the nasolabial fold during smiling |
|---|
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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