Which structure is NOT part of the inner ear?

Which structure is NOT part of the inner ear?

• A. Tympanic membrane
• B. Cochlea
• C. Hair cells
• D. Basilar membrane

Answer: (A)

The inner ear includes structures like the cochlea, the vestibular apparatus, and the sensory elements inside the cochlea such as hair cells on the basilar membrane. The basilar membrane vibrates in response to different sound frequencies, and the hair cells on it convert those mechanical motions into neural signals. The tympanic membrane, or eardrum, belongs to the outer ear; it captures sound waves and transmits those vibrations to the middle ear bones. Since the tympanic membrane sits in the outer ear and not in the inner ear, it is not part of the inner ear. The other listed structures are integral components of the inner ear and function in hearing.

The inner ear includes structures like the cochlea, the vestibular apparatus, and the sensory elements inside the cochlea such as hair cells on the basilar membrane. The basilar membrane vibrates in response to different sound frequencies, and the hair cells on it convert those mechanical motions into neural signals. The tympanic membrane, or eardrum, belongs to the outer ear; it captures sound waves and transmits those vibrations to the middle ear bones. Since the tympanic membrane sits in the outer ear and not in the inner ear, it is not part of the inner ear. The other listed structures are integral components of the inner ear and function in hearing.