Question

In mammalian cochlea, the thin-walled sloping roof of the scala media is referred to as:

• A. Organ of Corti
• B. Scala tympani
• C. Basilar membrane
• D. Reissner’s membrane

Answer 1

The correct option is D Reissner’s membrane

Reissner's membrane (vestibular membrane) is a membrane inside the cochlea of the inner ear. It separates scala media from scala vestibuli. Together with the basilar membrane, it creates a compartment in the cochlea filled with endolymph. It functions as a diffusion barrier, allowing nutrients to travel from the perilymph to the endolymph of the membranous labyrinth. So, in mammalian cochlea, the thin-walled sloping roof of the scala media is referred to as Reissner's membrane.