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Given below is a diagrammatic cross section of a single loop of human cochlea:

1. B: Tectorial membrane, C: Perilymph, D: Secretory cells
2. C: Endolymph, D: Sensory hair cells, A: Serum
3. D: Sensory hair cells, A: Endolymph, B: Tectorial membrane
4. A: Perilymph, B: Tectorial membrane, C: Endolymph

Correct answer: A: Perilymph, B: Tectorial membrane, C: Endolymph

Solution

In a cochlear cross-section, the fluid surrounding the membranous duct is perilymph, while the fluid inside the cochlear duct is endolymph. The structure above the sensory hair cells is the tectorial membrane, so the labels match those anatomical positions.

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