Question

Select the correct identification group of labelled parts I, II, Ill.

• A. I - Scala vestibuli, II - Scala media, Ill - Scala tympani
• B. I - Scala vestibuli, II - Scala tympani, III - Scala media
• C. I - Scala tympani, II - Scala media, Ill - Scala vestibuli
• D. I - Scala media, II - Scala tympani, III - Scala media.

Answer 1

Answer: (A)

This figure shows the cross-section of a cochlea. There are three chambers in the cochlea: part I is the vestibular duct or scala vestibuli, which lies superior to the cochlear duct and abuts the oval window, part II is the cochlear duct or scala media, a region of high potassium ion concentration and part III is the tympanic duct or scala tympani, which lies inferior to the cochlear duct and terminates at the round window.

So, the correct answer is option A.