The tensor veli palatini tendon hooks around the pterygoid hamulus at the base of the medial pterygoid plate, changing direction by approximately 90 degrees to spread horizontally into the palatine aponeurosis of the soft palate. This pulley mechanism allows the vertically oriented muscle belly to exert a horizontal tensioning force on the soft palate. The tendon also contributes to the dilator mechanism of the Eustachian tube.
The tensor veli palatini tendon's relationship with the pterygoid hamulus is critical for two functions: tensioning the soft palate for speech and swallowing, and dilating the Eustachian tube at its pharyngeal opening during swallowing and yawning to equalise middle ear pressure. Cleft palate repairs must reconstruct the tensor tendon and its insertion into the palatine aponeurosis to restore velopharyngeal function. Dysfunction of the Eustachian tube dilator mechanism produces middle ear effusion (glue ear), particularly common in children with cleft palate.
Failure of the tensor veli palatini tendon mechanism to dilate the Eustachian tube during swallowing produces middle ear pressure dysregulation, manifesting as ear fullness, muffled hearing, and recurrent middle ear effusion, managed with nasal steroids, auto-inflation devices, or tympanostomy tube insertion.
Disruption of the tensor veli palatini tendon mechanism after cleft palate repair or following palatal trauma produces hypernasality during speech from inadequate velopharyngeal closure, requiring speech therapy and potentially surgical pharyngoplasty or palatal re-repair.
