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23 Cards in this Set
- Front
- Back
2 main jobs of the ear?
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hearing and balance
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2 types of balance?
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Static and Dynamic
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Describe Dynamic Balance...
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semicircular canals contain semicircular ducts which have a swelling at the base called ampulla.
W/I the ampulla is a crista which has hair cells surrounded by gel. When the head moves fluid moves bending hair cells causing action potential |
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Describe Static Balance...
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utricle and saccule contain a macula, macula has hair cells in gel with tiny stones to give it weight, when the head moves and holds position the gel slides, bending the hair cells and causing action potential
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3 regions of the ear?
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inner, outer, middle
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2 parts of the outer ear?
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pinna
external acoustic canal |
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Job of pinna...
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collects and funnels sound waves
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Job of external acoustic canal?
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funnels sound waves to tympanic membrane
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4 parts of the middle ear?
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auditory ossicles
oval window auditory tube stapidus muscles |
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Job of the auditory ossicles?
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(malleus, incus, stapes)-respond in response to sound waves
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Job of the oval window?
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separates the middle ear from inner ear, vibrates in response to sound waves
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Job of auditory tube?
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equalizes the pressure across the tympanic membrane and tensor tympani
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Job of stapidus muscles?
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contracts to protect you against prolonged loud noises
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5 parts of the inner ear?
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vestibular duct
vestibular membrane cochlear duct tympanic duct round window |
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Describe vestibular duct?
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sound waves enter here, contains perilymph
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Describe vestibular membrane...
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seperates vestibular and cochlear duct
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Describe cochlear duct...
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contains endolymph, contains organ of corti (transduces sound waves into action potential)
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Describe tympanic duct...
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contains perilymph, sound waves exit the inner ear here
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Describe round window...
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sound waves exit the ear here
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Sound pitch is determined where?
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the Organ of Corti
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How is sound pitch determined?
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the tectorial membrane vibrates, bending hair cells to generate AP, the basilar membrane also vibrates, but with differential elasticity.This means that high pitch sound crosses close to the oval window, and low pitch crosses far from the window.
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High pitch sound crosses ______
to the oval window, and low pitch sound crosses ______ from the oval window. |
close, and far
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The basilar membrane vibrates with __________ elasticity.
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differential
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