Question

activity 17 : quiz
module : nervous
topic : structures / type : combination

what structure is highlighted?

a. cochlear duct
b. nerve fibers of cochlea
c. scala tympani
d. spiral ligament of cochlea
e. spiral ganglion

attempt: 1/1
question: 24/25
correct: 20
score: 80%

Explanation:

Identify the highlighted region

Using the Cochlea Histology knowledge point, we examine the cross-section of the cochlear turn. The image shows the three fluid-filled chambers: the scala vestibuli (top), the cochlear duct (middle), and the scala tympani (bottom). The modiolus is located on the left side of this section.

Determine the specific structure

Using the Spiral Ganglion Histology knowledge point

$$ \text{Highlighted region} = \text{Spiral ganglion} $$

The green highlighted cluster of neuronal cell bodies is located within the bony modiolus (specifically within Rosenthal's canal). These bipolar neurons form the spiral ganglion, which gives rise to the auditory nerve fibers.

Answer:

• (A) Cochlear duct
• (B) Nerve fibers of cochlea
• (C) Scala tympani
• (D) Spiral ligament of cochlea
• (E) Spiral ganglion (Correct answer)