Question

A diagrammatic cross section of a single loop of human cochlea is shown in the given figure.
Which one of the following options correctly represents the names of any three of the labelled parts?

• A. A - Eendolymph, B - Tectorial membrane, D - Sensory hair cells
• B. A - Perilymph, B - Tectorial membrane, C- Endolymph
• C. B - Tectorial membrane, C - Perilymph, D - Secretory cells
• D. A - Serum, C - Endolymph, D - Sensory hair cells

Answer 1

The correct option is B A - Perilymph, B - Tectorial membrane, C- Endolymph

The inner ear has two parts, namely the bony labyrinth and the membranous labyrinth. The membranous labyrinth is contained within the bony labyrinth, and within the membranous labyrinth is a fluid called endolymph. Between the outer wall of the membranous labyrinth and the wall of the bony labyrinth is the location of perilymph. The tectorial membrane (TM) is one of two acellular membranes in the cochlea of the inner ear, the other being the basilar membrane (BM). The tectorial membrane is located above the spiral limbus and the spiral organ of Corti and extends along the longitudinal length of the cochlea parallel to the basilar membrane. It is divided into three zones, namely the limbal, middle and marginal zones.

Thus, the correct answer is 'A - perilymph, B - tectorial membrane, C- endolymph.'