Question

what structure is highlighted?

a. scala tympani
b. spiral organ
c. basilar membrane
d. spiral ligament of cochlea
e. spiral ganglion

Explanation:

Identify the histological section

Using the Cochlea Histology knowledge point
The image shows a cross-section of the bony cochlea, displaying multiple turns of the cochlear duct and its associated fluid-filled chambers.

Analyze the highlighted regions

Using the Scala Tympani knowledge point

• Each turn of the cochlea contains three main fluid-filled compartments: the scala vestibuli (superior), the scala media (middle, cochlear duct), and the scala tympani (inferior).
• The green highlighted regions are located in the lower/inferior compartment of each cochlear turn, beneath the basilar membrane and spiral organ.
• This inferior compartment is the scala tympani.

Answer:

• (A) Scala tympani (Correct answer)
• (B) Spiral organ
• (C) Basilar membrane
• (D) Spiral ligament of cochlea
• (E) Spiral ganglion