Question

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

what structure is highlighted?

a. basilar membrane
b. spiral ligament of cochlea
c. scala tympani
d. modiolus
e. stria vascularis

Explanation:

Identify the histological section

Using the Cochlea Histology knowledge point
The image shows a cross-section of the bony cochlea, which spirals around a central bony hub. Within each turn of the cochlea, three fluid-filled compartments (scalae) are visible: the upper scala vestibuli, the middle scala media (cochlear duct), and the lower scala tympani.

Analyze the highlighted region

Using the Scala Tympani knowledge point
The green highlighted regions are located at the basal/lower compartment of each cochlear turn. This lower compartment is the scala tympani, which is filled with perilymph and bounded superiorly by the basilar membrane.

Match with multiple-choice options

The highlighted structure corresponds to option C, Scala tympani.

Answer:

• (A) Basilar membrane
• (B) Spiral ligament of cochlea
• (C) Scala tympani (Correct answer)
• (D) Modiolus
• (E) Stria vascularis