What is the mechanism to hear ?
Answers
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The sound conducting mechanism has two parts, the outer ear consisting of the pinna and ear canal, and the middle ear consisting of the tympanic membrane. The middle ear air space is connected to the nose by the Eustachian tube and to the mastoid air cells housing the ossicular chain, the malleus, stapes and incus.
How Hearing Works
-Sound funnels into the ear canal and causes the eardrum to move.
-The eardrum vibrates with sound.
-Sound vibrations move through the ossicles to the cochlea.
-Sound vibrations cause the fluid in the cochlea to move.
-Fluid movement causes the hair cells to bend.
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Answer:
(1) The external ear receives the sound waves and sends to the tympanic membrane, The tympanum vibrates transmitting the vibrations to the chain of three ossicles and then to the oval window.
(2) The vibrations are further passed on to the fluid of cochica.
(3) The waves in the perilymph and endolymph induces movements in the basilar membrane.
(4) The hair cells of organ of Corti bend and are pressed against the tectorial membrane.
(5) Due to this pressure, the nerve impulses are generated and are sent to the afferent nerve fibres.
(6) The impulses are carried by the auditory nerves to the auditory centre of the brain, where the impulses are analyzed and the sound is perceived.