Tympanomastoid fissure

The tympanomastoid fissure is one of the intrinsic fissures of the temporal bone, located parallel and posterior to the bony external auditory canal, dividing the tympanic part of the temporal bone and mastoid process. Its radiological significance is as a fracture mimic (pseudofracture) 1. Its surgical significance is as a commonly used palpable landmark to localize the facial nerve trunk during parotidectomy or repair after facial trauma 2.

Article information

rID: 73156
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Tympanomastoid suture
  • Fissura tympanomastoidea

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