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문제

A nurse is assessing a patient's ear anatomy. Which structure is responsible for transmitting sound vibrations from the tympanic membrane to the inner ear?

해설
The ossicles (malleus, incus, stapes) transmit sound vibrations from the tympanic membrane to the inner ear. Other options are involved in balance or other ear functions.
같은 주제 다음 문제A nurse is assessing a client's ear anatomy. Which structure is responsible for transmitti…

심화 해설

Anatomy of Sound Transmission

The question asks which structure bridges the gap between the tympanic membrane (eardrum) and the inner ear. The correct answer is the ossicles.

To understand why, it helps to follow the path of a sound wave through the ear's anatomy. Sound waves enter the external auditory canal and strike the tympanic membrane, causing it to vibrate. This membrane is described as being comparable to a drumhead, vibrating in response to sound waves [1]. These vibrations must then be physically conducted across the air-filled middle ear cavity to reach the fluid-filled inner ear. This is the specific role of the ossicles. The middle ear cavity contains the three auditory ossicles—the malleus, incus, and stapes—which form a chain that transmits and amplifies sound vibrations from the tympanic membrane to the oval window of the inner ear [2]. The stapes footplate, the final bone in this chain, moves like a piston at the oval window to transfer mechanical energy into the cochlea [2][3].

The other options represent different structures with distinct functions:
* The cochlea is the part of the inner ear that receives the mechanical energy from the ossicles and converts it into neural impulses [1]. It is the destination, not the transmitter.
* The semicircular canals are also located in the inner ear but are responsible for balance and equilibrium, not hearing.
* The Eustachian tube connects the middle ear to the nasopharynx. Its function is to equalize air pressure on both sides of the tympanic membrane, not to transmit sound vibrations.

Therefore, the ossicles are the only structures that form the physical chain necessary to conduct sound vibrations from the tympanic membrane to the inner ear [1][2][3].
References (research sources)
  • [1]
    Tympanic Membrane PerforationResearch articleSutton AE, Weimer AD. (2026)
  • [2]
    Anatomy, Head and Neck: Middle EarResearch articlePeterson DC, Sutton AE. (2026)
  • [3]
    The Transmission of Sound to the Cochlea in Normal and Pathological Human Middle Ears.Research articleRosowski JJ. (2025) · DOI: 10.1007/s10162-025-00997-y

임상 시나리오

Clinical Ear Anatomy: Sound ConductionIdentifying the Ossicles' Role in Hearing

Sound waves strike the tympanic membrane, causing it to vibrate. These vibrations must be physically conducted across the air-filled middle ear to the fluid-filled inner ear. This is the sole function of the ossicles (malleus, incus, stapes).

The stapes footplate moves like a piston against the oval window, transferring mechanical energy into the cochlea. The cochlea then converts this energy into neural impulses. The semicircular canals are strictly for balance, and the Eustachian tube only equalizes pressure.

Caution

Conductive hearing loss results from dysfunction in the outer or middle ear (e.g., ossicular fixation, otitis media), while sensorineural loss involves the cochlea or auditory nerve. Differentiating the site of lesion is critical for NCLEX.

핵심 개념

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