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Ear Anatomy and Sound Transmission – 20 MCQ Quiz
20 MCQs covering external ear, middle ear, ossicles, auditory tube, facial nerve, cochlea, hearing and vestibular apparatus.
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1. What is the primary function of the auricle (pinna)? *
The auricle collects and directs sound waves toward the external auditory canal.
2. Sound waves travelling through the external auditory canal ultimately strike the: *
The tympanic membrane vibrates in response to incoming sound waves.
3. The point of maximum inward displacement of the tympanic membrane is called the: *
The umbo is the most depressed central point of the tympanic membrane and is attached to the handle of the malleus.
4. Which sequence correctly represents the three auditory ossicles from lateral to medial? *
Sound vibrations are transmitted through malleus, incus and finally stapes.
5. Which of the following is the smallest and most medial auditory ossicle? *
The stapes is the smallest ossicle and its footplate occupies the oval window.
6. The footplate of the stapes is attached to the: *
The stapes footplate transmits mechanical vibrations to the inner ear through the oval window.
7. Which muscles protect the inner ear from excessive sound vibrations? *
Contraction of these middle-ear muscles reduces transmission of excessive sound energy.
8. The reflex contraction of middle-ear muscles in response to loud sound is called the: *
The acoustic/stapedial reflex reduces transmission of intense sound to the inner ear.
9. The middle ear communicates with the nasopharynx through the: *
The auditory tube connects the middle ear with the nasopharynx.
10. The major function of the Eustachian tube is to: *
The auditory tube helps equalize middle-ear pressure with atmospheric pressure.
11. Dysfunction or obstruction of the Eustachian tube predisposes to: *
Poor ventilation and drainage of the middle ear can predispose to otitis media.
12. Infection from the middle ear can spread posteriorly to the: *
The mastoid antrum and mastoid air-cell system communicate with the middle-ear region and can become involved in infection.
13. Which cranial nerve passes through the temporal bone in close relationship to the middle ear? *
The facial nerve travels through the facial canal in close relationship to the middle ear.
14. The facial nerve is also known as: *
The facial nerve is cranial nerve VII.
15. The cochlea is primarily concerned with: *
The cochlea contains the sensory apparatus responsible for hearing.
16. The sensory receptor organ for hearing within the cochlea is the: *
The Organ of Corti contains sensory hair cells responsible for transducing sound vibrations.
17. Sound-induced movement of cochlear fluid ultimately causes stimulation of: *
Movement of cochlear fluid produces mechanical displacement that bends the stereocilia of hair cells.
18. Auditory information from the cochlea is carried centrally by the: *
The cochlear nerve is the auditory division of the vestibulocochlear nerve (CN VIII).
19. The three semicircular canals primarily detect: *
The semicircular canals detect angular acceleration in different planes.
20. Which structures contain otoliths (otoconia) and primarily detect linear acceleration and head position relative to gravity? *
Otoliths are present in the utricle and saccule. The semicircular canals primarily detect angular acceleration.
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