Question

module: nervous
topic: structures / type: combination

what structure is highlighted?

a. basilar membrane
b. tectorial membrane
c. inner phalangeal cells
d. outer hair cell
e. inner hair cell

Explanation:

Identify the histological section

Using the Organ of Corti Anatomy knowledge point
The image shows a high-magnification histological section of the organ of Corti within the cochlea of the inner ear.

Analyze the highlighted structure

Using the Basilar Membrane Structure knowledge point
The highlighted structures are three adjacent, columnar-shaped cells colored in green/yellow. These are located on the outer side of the tunnel of Corti, resting on the basilar membrane.

Differentiate the cell types

The organ of Corti contains inner and outer hair cells:

• A single row of inner hair cells is located medially (closer to the spiral lamina/inner side).
• Three rows of outer hair cells are located laterally (on the outer side).
• The three highlighted cells in green represent the three rows of outer hair cells.

Match with options

The highlighted structures correspond to the outer hair cells, which matches option D.

Answer:

• (A) Basilar membrane
• (B) Tectorial membrane
• (C) Inner phalangeal cells
• (D) Outer hair cell (Correct answer)
• (E) Inner hair cell