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HEENT CABS > Hearing & Balance > Flashcards

Hearing & Balance Flashcards

1
Q

What is the ear canal lined with

A

keratinized squamous epithelium

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2
Q

Where are ceruminous glands located within the ear

A

cartilaginous section of the external canal

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3
Q

Is cerumen acidotic or alkalotic and why

A

Acidotic for antimicrobial effect

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4
Q

At what age is the Eustachian tube adult sized

A

age 6

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5
Q

What structure in the ear is used for hearing

A

cochlea

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6
Q

How does the cochlea allow for hearing

A

contains organ of corti which converts sound waves into nerve impulse

its neurotransmission then occurs via the vestibulocochlear nerve

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7
Q

What does the vestibule contain

A

semicircular canals
utricle
saccule

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8
Q

What does the vestibule allow for

A

gives us our position in space

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9
Q

What is the process of hearing

A

sound strikes tympanic membrane causing vibration of mallows, incus, stapes

this taps on the oval window of cochlea

movement is then transmitted via endolymph

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10
Q

How much does the cochlea turn

A

2.5 times

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11
Q

What determines the location of stimuli in the ear

A

the frequency of the sound of pitch

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12
Q

Where are lower sounds heard in comparison to higher pitched sounds

A

lower sounds are heard further in

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13
Q

what is the function of the hair cells

A

detects movement of the endolymph from sound transmission

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14
Q

What determines how loud the sound is we hear

A

The number of hair cells involved

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15
Q

Where are the sensory cells located

A

within the utricle and saccule

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16
Q

What are the sensory cells

A

maculae

17
Q

What are the sensory cells

A

maculae

18
Q

what is the function of the semicircular canals

A

head position

19
Q

what is the function of the hair cells within the maculae

A

create action potential from mechanical movement which then goes to vestibular ganglion

20
Q

What are the hair cells in the maculae covered in

A

gelatinous substance
otoliths

21
Q

Which part of the vestibular system is involved with linear acceleration

A

utricle

22
Q

What do the otoliths do during movement

A

move with gravity

23
Q

What fluid is found within the semicircular canal

A

endolymph

24
Q

What is found at the end of the semicircular canal

A

bulbs structure -> ampullae

25
Q

What is within the ampullae

A

the sensory aspect of the canal system (crista ampullaris)

26
Q

Where are the hair cells located within the semicircular canal

A

crista ampullaris

HEENT CABS (6 decks)

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