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23 Cards in this Set

  • Front
  • Back
2 main jobs of the ear?
hearing and balance
2 types of balance?
Static and Dynamic
Describe Dynamic Balance...
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
Describe Static Balance...
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
3 regions of the ear?
inner, outer, middle
2 parts of the outer ear?
pinna
external acoustic canal
Job of pinna...
collects and funnels sound waves
Job of external acoustic canal?
funnels sound waves to tympanic membrane
4 parts of the middle ear?
auditory ossicles
oval window
auditory tube
stapidus muscles
Job of the auditory ossicles?
(malleus, incus, stapes)-respond in response to sound waves
Job of the oval window?
separates the middle ear from inner ear, vibrates in response to sound waves
Job of auditory tube?
equalizes the pressure across the tympanic membrane and tensor tympani
Job of stapidus muscles?
contracts to protect you against prolonged loud noises
5 parts of the inner ear?
vestibular duct
vestibular membrane
cochlear duct
tympanic duct
round window
Describe vestibular duct?
sound waves enter here, contains perilymph
Describe vestibular membrane...
seperates vestibular and cochlear duct
Describe cochlear duct...
contains endolymph, contains organ of corti (transduces sound waves into action potential)
Describe tympanic duct...
contains perilymph, sound waves exit the inner ear here
Describe round window...
sound waves exit the ear here
Sound pitch is determined where?
the Organ of Corti
How is sound pitch determined?
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.
High pitch sound crosses ______
to the oval window, and low pitch sound crosses ______ from the oval window.
close, and far
The basilar membrane vibrates with __________ elasticity.
differential