Given is a diagrammatic cross section of a single loop of human cochlea.
Which one of the following options correctly represents the names of three different parts?

D- Sensory hair cells, A- Endolymph, B- Tectorial membrane`

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A- Perilymph, B- Tectorial membrane, C- Endolymph

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B- Tectorial membrane, C- Perilymph, D- Secretory cells

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C- Endolymph, D- Sensory hair cells, A- Serum

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Solution

The correct option is B A- Perilymph, B- Tectorial membrane, C- Endolymph
Perilymph is an extracellular fluid located within the cochlea (part of the inner ear) in two of its three compartment, the scala tympani and scala vestibuli. The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid.
Tectorial membrane is a membrane having the consistency of jelly that covers the surface of the organ of Corti.
Endolymph is the fluid contained in the membranous labyrinth of the inner ear.
Therefore, the correct answer is option B.

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