Explain the mechanism of hearing.

Explanation

Mechanism of hearing :

1. Sound waves entering the external auditory mealus fall on the tympanic membrane. This causes the ear drum to vibrate.
2. These vibration are transmitted to the oval window through the three auditory ossicles.
3. Since the tympanic membrane is 17 - 20 times larger than the oval window, The pressure exerted o the oval window in about 20 times more than than on the tympanic membrane.
4. This pressure causes the round window to alternately bulge outward and inward meanwhile the basilar membrane along with the organ of Corti move up and down.
5, These movement of the hair alternately open and close the mechanically gated ion channels in the base of hair cells and the action potential is propagated to the sound sensation through cochlear nerve.