Question

module: nervous
topic: structures / type: combination

what structure is highlighted?

a. vestibulocochlear n. (cn viii)
b. tympanic membrane
c. incus
d. vestibule of ear
e. malleus

Explanation:

Identify the highlighted structure

Using the Vestibulocochlear Nerve Anatomy knowledge point

• The anatomical diagram shows a cross-section of the human ear, including the outer ear canal, tympanic membrane, middle ear ossicles, and the inner ear structures (cochlea and semicircular canals).
• A specific structure emerging from the inner ear (cochlea and vestibule) and heading medially toward the brainstem is highlighted in bright green.
• This highlighted structure represents the vestibulocochlear nerve (Cranial Nerve VIII), which carries sensory information for both hearing and balance.

Evaluate the given options

• A. Vestibulocochlear n. (CN VIII): Correct. The green highlighted structure is the nerve bundle arising from the cochlea and vestibular apparatus.
• B. Tympanic membrane: Incorrect. The tympanic membrane (eardrum) is located at the end of the external acoustic meatus and is colored purple/pink in this diagram.
• C. Incus: Incorrect. The incus is one of the middle ear ossicles, located between the malleus and stapes.
• D. Vestibule of ear: Incorrect. The vestibule is the central part of the bony labyrinth in the inner ear, situated medial to the tympanic cavity.
• E. Malleus: Incorrect. The malleus is the hammer-shaped middle ear bone attached to the tympanic membrane.

Answer:

• A. Vestibulocochlear n. (CN VIII) (Correct answer)
• B. Tympanic membrane
• C. Incus
• D. Vestibule of ear
• E. Malleus