Given below 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?
A: Perilymph, B : Tectorial membrane ,C: Endolymph
— Concept: This question tests your understanding of the internal structure of the human cochlea, specifically…Concept: This question tests your understanding of the internal structure of the human cochlea, specifically identifying its fluid-filled chambers and associated membranes.
Why (B) is correct:
The diagram shows a cross-section of the cochlea. Let's identify the labeled parts:
- A points to the fluid in the scala vestibuli, which is filled with perilymph.
- B points to the tectorial membrane, which overlies the hair cells of the organ of Corti.
- C points to the fluid in the scala media (cochlear duct), which is filled with endolymph.
Therefore, option B correctly identifies A as Perilymph, B as Tectorial membrane, and C as Endolymph.
Why other options are wrong:
- A: D represents sensory hair cells, not A. A is perilymph.
- C: C is endolymph, not perilymph. D represents sensory hair cells, not secretory cells.
- D: A is perilymph, not serum. C is endolymph.
Common Mistake: Students often confuse perilymph and endolymph, and their locations within the cochlea.
NEET Tip / Mnemonic: Remember that the Endolymph is in the middle (cochlear duct), and the Perilymph is on the edges (scala vestibuli and scala tympani).
Correct Answer: (B)
A: Perilymph, B : Tectorial membrane ,C: Endolymph