The tensor veli palatini is the primary opener of the Eustachian tube, contracting during swallowing and yawning to equalise middle ear pressure. It is the only soft palate muscle innervated by the trigeminal nerve rather than the vagus, reflecting its different embryological origin from the first branchial arch. Dysfunction of this muscle from cleft palate is the primary mechanism of the recurrent otitis media that affects children with cleft palate before surgical repair.
| Origin | Scaphoid fossa of the sphenoid bone, spine of the sphenoid, and lateral wall of the Eustachian tube |
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| Insertion | Hooks around the pterygoid hamulus and spreads horizontally into the palatine aponeurosis |
| Nerve Supply | Medial pterygoid nerve from the mandibular nerve (V3), the only palatal muscle NOT supplied by CN X |
| Blood Supply | Minor palatine artery |
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Every time a person swallows, the tensor veli palatini contracts to briefly open the Eustachian tube and equalise middle ear pressure, preventing the barotrauma that would occur if this mechanism failed. This is why swallowing or yawning relieves ear pressure during altitude changes.
Eustachian tube dysfunction from tensor veli palatini weakness or fibrosis produces chronic negative middle ear pressure, effusion (glue ear), and recurrent otitis media. Children with cleft palate have a structurally abnormal tensor veli palatini that fails to open the Eustachian tube effectively, making them prone to chronic otitis media with effusion requiring ventilation tube insertion alongside palate repair.
Not accessible to external palpation due to its deep position at the skull base lateral to the pterygoid plates.
Tensor veli palatini weakness or fibrosis producing chronic negative middle ear pressure, glue ear, and conductive hearing loss managed with ventilation tubes.
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