Musculus uvulae

The musculus uvulae is a small paired muscle within the midline of the soft palate that elevates and stiffens the uvula, assisting in the closure of the nasopharynx during swallowing and speech. Two narrow slips that may fuse in the midline, forming the core of the uvula.

Anatomical details

1. Origin

From the posterior nasal spine of the palatine bones and the palatine aponeurosis.

2. Insertion

Into the mucosa of the uvula at the posterior free edge of the soft palate.

Innervation

Supplied by the pharyngeal branch of the vagus nerve (CN X) via the pharyngeal plexus.

Actions

• Shortens and elevates the uvula.

• Stiffens the central part of the soft palate, aiding the levator veli palatini in sealing the nasopharynx during swallowing and phonation.

Clinical correlate

Paralysis of the muscle (e.g., due to vagus nerve lesion) causes uvular deviation to the opposite side, which can help localize neurological lesion as part of the cranial nerve examination.