The endolymph of the membranous labyrinth is produced primarily by which structure?
- A Stria vascularis ✓
- B Reissner's membrane
- C Basilar membrane
- D Spiral ligament
Correct answer: A. Stria vascularis
Explanation
Endolymph is produced predominantly by the stria vascularis, a richly vascularized epithelium lining the lateral wall of the cochlear duct. It is high in potassium and low in sodium, creating the endocochlear potential essential for hair-cell mechanoelectrical transduction. Reissner's membrane forms the roof separating endolymph from perilymph.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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