The endolymph-filled scala media (cochlear duct) is separated from the perilymph-filled scala vestibuli by:
- A Basilar membrane
- B Reissner's membrane (vestibular membrane) ✓
- C Tectorial membrane
- D Stria vascularis
Correct answer: B. Reissner's membrane (vestibular membrane)
Explanation
Reissner's membrane (vestibular membrane) separates the endolymph in the scala media (cochlear duct) from the perilymph in the scala vestibuli above. The basilar membrane separates the scala media from the scala tympani below (perilymph). The tectorial membrane overlies the hair cells of the organ of Corti within the scala media. The stria vascularis on the lateral wall of the scala media produces and maintains endolymph composition (high K+).
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.