Question

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

what structure is highlighted?

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

Explanation:

Identify the highlighted anatomical region

Using the Cochlea Histology Identification knowledge point
The histological section shows a cross-section of a turn of the cochlea. The region highlighted in green is located on the outer wall of the cochlear duct (scala media). This thickened periosteum lining the outer bony wall of the cochlea is the spiral ligament.

Correlate with the multiple-choice options

Using the Cochlea Histology knowledge point

• A. Tectorial membrane: The gelatinous structure overlying the hair cells (not highlighted).
• B. Spiral organ: The organ of Corti resting on the basilar membrane (not highlighted).
• C. Spiral ligament of cochlea: The green highlighted connective tissue lining the outer wall.
• D. Spiral ganglion: Located within the modiolus on the left side of the image (not highlighted).
• E. Basilar membrane: The membrane supporting the spiral organ (not highlighted).

Therefore, the highlighted structure is the spiral ligament of the cochlea.

Answer:

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