Introduction of hearing

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this structure provide more surface area for receptor cells & allow mammals greater sensitivity to pitch & volume Then is present in other animals.

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Process of hearing

The process of hearing can be summarized as follows;

Sound waves enter the outer ear and create pressure waves that reached the tympanic membrane.

Air molecules under pressure vibrate the tympanic membrane.

The vibration move the Malleus to the other side of the membrane.

The handle of the Malleus strike the incus, vibrating it.

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Process of hearing

5. The vibrating incus moves the stapes back & forth against the oval window.

6. The movement of the oval window set up pressure changes that vibrate the fluid in the inner ear. These vibrations are transmitted to the basilar membrane, causing it to ripple.

7. Receptor hair cells of the organ of corti that are in contact with the overlying tectorial membrane are bent, causing a generator potential , which leads to an action potential that travel along the vestibulocochlear nerve to the brain for interpretation .

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Process of hearing

8. vibration in the cochlear fluid dissipate as a result of movement of the round window.