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How Do We Hear

Which of the ...

Question

Which of the following part is found in the inner ear?

A

Cochlea

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B

Stirrup

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C

Eardrum

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D

Iris

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Solution

The correct option is A
Cochlea

The ear is made up of 3 parts - outer, middle and the inner ear. The cochlea is found in the inner ear. The stirrup and eardrum are found in the middle ear. Iris is found in the eye.

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Q. Three small interlocking bones: the hammer, the anvil, and the stirrup transmit the vibrations of the eardrum to the inner ear.

Q. The part of the ear that transmits sound vibrations to the brain is the
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(b) stirrup.
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(d) auditory nerve.

Q. When a sound wave enters the ear, it sets the eardrum into oscillation, which in turn causes oscillation of 3 tiny bones in the middle ear called ossicles. This oscillation is finally transmitted to the fluid filled in inner portion of the ear termed as inner ear, the motion of the fluid disturbs hair calls within the inner ear which transmit nerve impulses to the brain with information that a sound is present. The three bones present in the middle ear are named as hammer, anvil and stirrup. Out of these the stirrup is the smallest one and this only connects the middle ear to inner ear as shown in the figure below. The area of stirrup and its extent of connection with the inner ear limits the sensitivity of the human ear. Consider a person's eat whose moving part of the eardrum has an area of about 43 mm

^{2}

and the area of stirrup is about 3.2 mm

^{2}

. The mass of ossicles is negligible. As a result, force exerted by sound wave in air on eardrum and ossicles is same as the force exerted by ossicles on the inner ear. Consider a sound wave having maximum pressure fluctuation of

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Pa. Frequency of sound wave is 1200 Hz.
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Q. Iris is a part of

Q. The bone attached to the inner surface of the eardrum is called

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