The incisivii labii superioris (upper) is one of the smaller perioral muscles contributing to lip shaping during speech and expression. It is part of the modiolus complex, the fibromuscular node at each lip corner.
| Origin | Alveolar process of the maxilla, above the lateral incisor |
|---|---|
| Insertion | Modiolus at the upper lip corner |
| Nerve Supply | Facial nerve, buccal branch (VII) |
| Blood Supply | Superior labial artery |
| Actions |
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|---|
It draws the corner of the mouth medially and helps purse the upper lip.
The incisivii labii muscles contribute to the perioral muscle ring. In cleft lip repair, the perioral muscle reconstruction must account for all modiolus muscles including the incisivii labii to restore functional lip competence and normal speech articulation.
Not individually palpable, acts as part of the perioral muscle group.
Abnormal incisivii labii attachment in cleft lip requiring repositioning during repair to restore the complete perioral muscle ring and normal lip function.
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