In modified radical mastoidectomy, which structure forms the 'facial ridge' that must be reduced to adequately exteriorize the mastoid cavity?
- A Posterior wall of the external auditory canal overlying the vertical segment of the facial nerve ✓
- B Tegmen tympani
- C Posterior wall of the middle ear cleft at the level of the round window
- D Mastoid tip cortex
Correct answer: A. Posterior wall of the external auditory canal overlying the vertical segment of the facial nerve
Explanation
The facial ridge is the bony ridge of the posterior external auditory canal wall that overlies the vertical (mastoid) segment of the facial nerve. Reducing this ridge during modified radical mastoidectomy is essential to create a wide, self-cleaning mastoid bowl while carefully avoiding injury to the underlying facial nerve, which runs medial and deep to this ridge.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.