Question

module: nervous
topic: structures / type: combination

what structure is highlighted?

a. cochlea
b. tympanic membrane
c. semicircular canals
d. vestibule of ear
e. auricle of ear

Explanation:

Identify the highlighted structure

Using the Middle Ear Anatomy knowledge point
The anatomical diagram shows a cross-section of the human ear, highlighting a specific structure in bright green. This structure is located at the medial end of the external acoustic meatus (ear canal) and forms the boundary between the outer ear and the middle ear cavity.

Evaluate the options

Using the Middle Ear Anatomy knowledge point

• A. Cochlea: The spiral, snail-shell-like structure of the inner ear, visible on the far right in white/grey.
• B. Tympanic membrane: The thin, semi-transparent membrane (eardrum) that separates the external ear canal from the middle ear. This matches the green highlighted structure.
• C. Semicircular canals: The three looped structures of the inner ear, located superior to the cochlea.
• D. Vestibule of ear: The central part of the bony labyrinth in the inner ear, situated between the cochlea and semicircular canals.
• E. Auricle of ear: The external, visible portion of the ear (pinna) on the far left.

Answer:

• (A) Cochlea
• (B) Tympanic membrane (Correct answer)
• (C) Semicircular canals
• (D) Vestibule of ear
• (E) Auricle of ear