Mechanism of hearing

Cochlea is concerned with hearing.

Mechanism involved:

• Pinna / auditory canal collect sound and strikes on ear drum which cause vibration of ear drum.
• Vibration of eardrum cause vibration of ear ossicles which increase intensity of sound.
• Oval window move to and fro which cause pressure change in perilymph of vestibular canal.
• This result in vibration of reisnner’s membrane, changes pressure in endolymph of middle canal.
• Phonoreceptors cell become stimulated and hair cells of organ of corti bent.
• Pressure change in middle canal endolymph causes the rippling of basilar membrane. This is concerned with frequency and intensity of sound.
• Now, stimulated phonoreceptor cells create nerve impulse which is conducted to brain by auditory nerve then after sound can be heard.