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12 Cards in this Set
- Front
- Back
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Functions |
•hearing •equilibrium and balance |
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Pinna |
External ear •collects and directs sound waves into the auditory canal |
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External auditory canal |
External ear •short. Narrow chamber that directs sound waves to the tympanic membrane |
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Tympanic membrane |
External ear •sound waves vibrate the membrane |
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Middle ear(tympanic cavity) |
External ear • air filled cavity •auditory(eustachian) tube _connects middle ear to throat _helps equalize pressure in ear •spanned by ossicles which transmit the vibratory motion of the eardrum to the oval window and the fluids of the inner ear |
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What are ossicles? |
•malleus(hammer) •incus(anvil) •stapes(stirrup) |
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Inner ear |
External ear •osseous-bon chambers filled with fluid _cochlea=contains organ of corti which contains hair fells that transmit the impulses to the vestibulocochlear nerve and finally the temporal lobe of the brain •vestobule •semicircular canals |
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Equilibrium |
•static(at rest) _maculae (receptors) in vestibule report the position of the head to the pull of gravity when the body is not moving _macular transmit message to vestibular nerve that tells cerebellum your heads position is space(balance) •dynamic _dynamic equilibrium receptors in semicircular canal respond to angular or rotatory movements of the head and transmit message to cerebellum via the cost I bump cochlear tube |
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Deafness |
•hearing loss of any damage _2 kinds |
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Conduction deafness |
Something interferes with the conduction of sounds vibration to the fluids of the inner ear _caused by Mechanical factors such as build up or earwax:fusion of ossicles ruptured ear drum |
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Sensorineural deafness |
•degenratice or damage |
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List of sound travels |
•pinna •external auditoy tube •tympanic membrane •malleus •incus •stapes •oval window •organ of corti in cochlea •hair cells •vestibulocoxhlear tube |
