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Tensor veli palatini muscle

The tensor veli palatini muscle is a slender, ribbon-like muscle of the soft palate crucial for normal swallowing and auditory tube function. It plays a key role in tensing the soft palate and opening the pharyngotympanic (Eustachian) tube during swallowing and yawning, helping to equalize middle ear pressure. Understanding its detailed anatomy, nerve and blood supply, and imaging characteristics is essential for clinicians and radiologists evaluating palatal and middle ear pathologies.

Function

  • Tenses the soft palate during swallowing and phonation

  • Opens the pharyngotympanic (Eustachian) tube to equalize pressure in the middle ear

  • Prevents reflux of food into the nasopharynx during swallowing

Origin

  • Scaphoid fossa of the sphenoid bone (base of the medial pterygoid plate)

  • Spine of the sphenoid bone

  • Lateral aspect of the cartilaginous part of the pharyngotympanic (Eustachian) tube

Insertion

  • Palatine aponeurosis (the broad, flat tendon in the soft palate)

  • Fibers intermingle with those of the opposite side at the midline

Nerve Supply

  • Mandibular nerve (V3), a branch of the trigeminal nerve (cranial nerve V)

  • Specifically, supplied by the medial pterygoid nerve (a branch of V3)

Artery Supply

  • Branches of the ascending palatine artery (from the facial artery)

  • Branches from the ascending pharyngeal artery (from the external carotid artery)

  • Lesser palatine arteries may contribute

Vein Supply

  • Drained mainly by the pterygoid venous plexus

  • Additional drainage into the pharyngeal venous plexus

MRI Appearance

  • T1-Weighted Images:

    • The tensor veli palatini appears as an intermediate-to-low signal intensity structure along the lateral aspect of the soft palate and adjacent to the Eustachian tube.

  • T2-Weighted Images:

    • Normal muscle demonstrates relatively low signal intensity, but increased signal may indicate edema or pathology.

  • STIR (Short Tau Inversion Recovery):

    • Normally low signal (like other muscles), but can become hyperintense in cases of edema, inflammation, or injury.

CT Appearance

  • Appears as a soft tissue density band extending from the sphenoid bone to the soft palate, lateral to the levator veli palatini

  • Not easily separated from adjacent muscles unless there is pathology or fat stranding

  • May be better visualized on high-resolution or contrast-enhanced studies

MRI images

Tensor veli palatini muscle mri axial image -img-00000-00000