Question

what structure is highlighted?

a. spiral organ
b. scala vestibuli
c. spiral ligament of cochlea
d. nerve fibers of cochlea
e. scala tympani

Explanation:

Identify the highlighted region

Using the Cochlea Histology and Scala Tympani knowledge points
The histological cross-section shows one turn of the cochlea, which is divided into three fluid-filled chambers:

• The upper chamber is the scala vestibuli.
• The middle chamber is the cochlear duct (scala media), separated from the scala vestibuli by the vestibular membrane.
• The lower chamber, highlighted in green at the bottom, is the scala tympani, separated from the cochlear duct by the basilar membrane.

Match with options

Using the Scala Tympani knowledge point
The green highlighted region corresponds to the scala tympani, which is option E.

Answer:

• A. Spiral organ
• B. Scala vestibuli
• C. Spiral ligament of cochlea
• D. Nerve fibers of cochlea
• E. Scala tympani (Correct answer)