UNT SPHS 2015 - 10 BB Biological Foundations of Hearing F13(1)(1) (20 pages)

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10 BB Biological Foundations of Hearing F13(1)(1)



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10 BB Biological Foundations of Hearing F13(1)(1)

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Pages:
20
School:
University of North Texas
Course:
Sphs 2015 - Nat Comm Dis
Unformatted text preview:

01 14 19 1 01 14 19 Sound enters our ear and is modified to sound energy and transmitted to the brain Our brain processes and interprets sound energy We hear with our brains not our ears Video of process http science education nih gov supplements nih3 hearin g activities lesson4 htm 2 01 14 19 5 sections 1 Outer ear 2 Middle ear 3 Inner ear 4 Acoustic nerve 5 Brain s auditory processing centers 3 01 14 19 Outer Ear Middle Ear Inner Ear 4 01 14 19 Pinna visible portion of the ear Canal connects pinna with eardrum Cerumen waxy substance found in ear 5 01 14 19 Pinna a sound collector Canal protects the tympanic membrane eardrum and enhances sound pressure 6 01 14 19 Tympanic membrane eardrum Ossicles Eustachian tube 7 01 14 19 8 01 14 19 Acts as a transformer by boosting the pressure of sound energy to inner ear Tympanic membrane eardrum Forms airtight and sterile seal to middle ear Thin flexible responsive to sound wave energy 9 01 14 19 Ossicles three tiny bones in middle ear Malleus hammer Incus anvil Stapes stirrup The ossicles work together to boost and transmit pressure to inner ear 10 01 14 19 Eustachian tube Connects middle ear to pharynx back of throat Opens with each swallow Maintains equal pressure between middle ear and outside Allows drainage of fluid from middle ear 11 01 14 19 Two muscles in the ear provide protection against extremely loud noises tensor tympani tenses the eardrum to lessen vibration stapedius stiffens the ossicular chain 12 01 14 19 Name the part of the ear given its function Drains fluid from the middle ear Ear drum protection Transmit sound from the ear drum to the inner ear Collects sound and funnels it into the ear canal Pressure equalizer Provides protection of the middle ear Provide protection against extremely loud sounds 13 01 14 19 Converts energy to a code which can be interpreted by the brain Oval window Cochlea Endolymph 14 01 14 19 Oval window small opening in the cochlea that connects to the footplate of the stapes Cochlea snail like organ containing hair cells and Endolymph fluid that fills the cochlea 15 01 14 19 Basilar membrane floor of the cochlea Organ of Corti contains hair cells called cilia which respond to movement of the endolymph Hair cells http youtu be U HU gzhmq4U 16 01 14 19 Acoustic nerve carries neural impulses to the brain Two divisions vestibular division transmits information from the semicircular canals for balance auditory division transmits information from the cochlea for hearing 17 01 14 19 18 01 14 19 The tympanic membrane and ossicular chain vibrate in response to incoming sound waves The footplate of the stapes moves against the oval window causing movement of the endolymph in the cochlea The hair cells cilia on the basilar membrane of the cochlea move as the endolymph moves 19 01 14 19 The movement of the hair cells creates signals which are translated into nerve impulses The nerve ending of the auditory division of the acoustic nerve picks up the impulses and transmits them to the brain Journey into the Ear http www youtube com watch v MIKvReMGu5Q 20


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