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The diagrammatic cross section of a single loop of human cochlea represents three different parts- A- Perilymph B- Tectorial membrane C- Endolymph Cochlea arises from sacculus. It is spirally coiled duct. It is also known as Lagena. It is connected with sacculus by duct of reuniens.

1. A- Perilymph, B- Tectorial membrane, C- Endolymph
2. A- Endolymph, B- Tectorial membrane, C- Perilymph
3. A- Tectorial membrane, B- Perilymph, C- Endolymph
4. A- Endolymph, B- Perilymph, C- Tectorial membrane

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

Solution

In a cochlear cross-section, the scala vestibuli and scala tympani are filled with perilymph, while the cochlear duct (scala media) contains endolymph. The tectorial membrane lies within the cochlear duct above the sensory hair cells, so the labels match A, B, and C respectively.

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