Question at position 49 In the auditory system, the bones of the middle ear vibrate by vibrations of theeardrum.saccule.basilar membrane.cochlea.单项选择题
A
eardrum.
B
saccule.
C
basilar membrane.
D
cochlea.

Question

Question at position 49 In the auditory system, the bones of the middle ear vibrate by vibrations of theeardrum.saccule.basilar membrane.cochlea.

BlackTom AI · Accepted Answer

The question asks which structure causes the bones of the middle ear to vibrate in the auditory system.
Option 1: eardrum. This is correct because the tympanic membrane (eardrum) vibrates in response to sound waves, and those vibrations are transmitted to the ossicular chain (the small bones in the middle ear). This chain amplifies and conveys the mechanical energy to the inner ear.
Option 2: saccule. The saccule is part of the vestibular system in the inner ear involved in balance, not in the mechanical transmission of sound to the middle ear bones. It does not cause the ossicles to vibrate.
Option 3: basilar membrane. The basilar membrane is a structure within the cochlea of the inner ear that responds to vibrations to convey mechanical energy into neural signals. It is downstream of the middle ear and does not drive the middle-ear bones.
Option 4: cochlea. The cochlea is the spiral-shaped organ in the inner ear where transduction of sound into neural signals occurs. It contains the basilar membrane and hair cells, but it does not initiate or cause the ossicles to vibrate.
Thus, the middle-ear bones’ vibration is initiated by the eardrum translating air vibrations into mechanical movement for the ossicular chain, while the other options refer to inner-ear structures involved later in the auditory processing pathway.

Question at position 49 In the auditory system, the bones of the middle ear vibrate by vibrations of theeardrum.saccule.basilar membrane.cochlea.单项选择题

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