The musculus uvulae is a paired muscle within the uvula that shortens and thickens it during velopharyngeal closure, contributing additional bulk to the soft palate seal against the posterior pharyngeal wall. It is the only intrinsic palatal muscle without an attachment to a bony structure. Its contribution to velopharyngeal closure explains why uvulectomy for snoring can actually worsen velopharyngeal function.
| Origin | Posterior nasal spine and palatine aponeurosis |
|---|---|
| Insertion | Mucous membrane of the uvula |
| Nerve Supply | Pharyngeal plexus via the vagus nerve (CN X) |
| Blood Supply | Minor palatine artery |
| Actions | Shortens and elevates the uvula; Adds bulk to the velopharyngeal closure to improve nasopharyngeal sealing |
|---|
By adding bulk to the elevated soft palate, the musculus uvulae helps fill the small residual gap between the palate and the pharyngeal wall that would otherwise allow nasal air escape during speech, acting as a fine-tuning mechanism for velopharyngeal competence.
Bifid uvula is a surface marker of submucous cleft palate, where the muscle is abnormally inserted laterally rather than crossing the midline, impairing velopharyngeal function. A bifid uvula should prompt investigation of the palate for a submucous cleft before adenoidectomy, as adenoid removal in submucous cleft patients commonly unmasks VPI by removing the adenoid pad that was compensating for the deficient levator.
The uvula is directly visible on oral examination at the midline posterior soft palate, and its movement can be assessed by observing elevation symmetry during phonation of the vowel 'ah'.
Asymmetric uvular movement away from the side of palatal weakness in vagal nerve palsy — a classic cranial nerve examination finding.
