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How Sounds Travel Through The Ear (2. Middle Ear (Malleus: Gets vibrations…
How Sounds Travel Through The Ear
1. External Ear
Auricle:
fleshy part of external ear. Directs sound waves toward external auditory meatus
External Acoustic Meatus:
the passage leading inward through the tympanic portion of the temporal bone, from the auricle to the tympanic membrane
Tympanic membrane
: thin layer of tissue in the human ear that receives sound vibrations from the outer air and transmits them to the auditory ossicles
2. Middle Ear
Malleus:
Gets vibrations from the tympanic membrane and "hammers" the vibrations
Incus:
Collects the vibrations and vibrates the stapes
Stapes:
Gets vibrations from incus and amplifies sounds about 22% and sends to the oval window
3. Inner Ear
Oval Window:
Sends the sound to scala vestibuli
Scala Vestibuli:
Conduct sounds vibration to the cochlear duct
Cochlear Duct:
Filled with fluid that vibrates when the sound waves from the stapes bone strike against it
Basilar Membrane:
Moves by incoming sound waves and is essential for the sense of hearing
Organ Of Corti:
The hair cells convert the vibrations into nerve impulses that are transmitted by the cochlear portion of the eighth cranial nerve to the brain.
vestibulocochlear nerve:
Responsible for the special senses of hearing and balance.
impluse created and sent along the auditory nerve
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