For cochlear implantation, the electrode array is inserted through which opening?
- A Oval window after stapedectomy
- B Round window membrane (cochleostomy anterior to round window) ✓
- C Promontory cochleostomy at the apex of cochlea
- D Through the stapes footplate
Correct answer: B. Round window membrane (cochleostomy anterior to round window)
Explanation
The standard electrode insertion for cochlear implantation is either through the round window membrane or through a cochleostomy drilled just anteroinferior to the round window niche, entering the scala tympani. The oval window approach would risk ossicular damage, and the apical cochleostomy is not a standard access point. The stapes footplate is not used.
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.