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Neuro Week 2 > Ear Anatomy > Flashcards

Ear Anatomy Flashcards

1
Q

is the lateral 1/3 of the external acoustic meatus cartilage or bone?

A

cartilage

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2
Q

is the medial 2/3 of the external acoustic meatus cartilage or bone?

A

bone that connects with tympanic membrane

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3
Q

what is the roof of the middle ear formed by?

A

tegmen tympani

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4
Q

what CN traverses in the middle ear?

A

facial nerve

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5
Q

name the three bones of the middle ear

A

malleus incus and stapes

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6
Q

what bone is against the tympanic membrane?

A

malleus

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7
Q

what bone covers the oval window?

A

stapes

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8
Q

what does the oval window lead to?

A

the inner ear

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9
Q

what is just inferior to the round window?

A

oval window

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10
Q

what are the two muscles of middle ear?

A

tensor tympani

stapedius

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11
Q

what is the role of the muscles of the middle ear?

A

they protect the ear from loud sounds

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12
Q

what nerve innervated the tensor tympani?

A

V3

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13
Q

what nerve innervates the stapedius?

A

facial nerve

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14
Q

what is role of tensor tympani?

A

tenses the eardrum

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15
Q

what is role of the stapedius?

A

dampens vibrations going into the oval window

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16
Q

what is the central depression in the tympanic membrane called?

A

umbo

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17
Q

what bone can you see on tympanic mem?

A

handle of the malleus

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18
Q

what bone does the tensor tympani insert on?

A

malleus

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19
Q

what is the bulge of the middle ear called?

A

promontory

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20
Q

where in the middle ear is the promontory?

A

medial most aspect

21
Q

what are the components of the vestibular apparatus in the inner ear?

A

semicircular canals and utricle and saccule

22
Q

what are the utricle and saccule responsible for in the inner ear?

A

vestibular sensation of linear accelerations

23
Q

what is the semicircular canal in charge of in vestibular system?

A

angular acceleration changes

24
Q

what is the inner ear area called?

A

bony labyrinth

25
Q

what is the bony labyrinth filled with?

A

perilymph

26
Q

what is suspened within the bony labyrinth?

A

membranous labyrinth

27
Q

what is the membranous labyrinth filled with?

A

endolymph

28
Q

what four things are in the membranous labyrinth?

A

cochlear duct
utricle and saccule
semicircular ducts

29
Q

what are the specialized sensory epithelium of the utricle and saccule called?

A

maculae

30
Q

what is the ampulla?

A

small swelling at base of semicircular ducts

31
Q

what does the ampulla have in it?

A

crista

32
Q

what are crista?

A

specialized sensory cells of the semicircular duct that responds to rotational movement

33
Q

how many turns does the cochlea make?

A

2.5

34
Q

what are the three chambers of the cochlea

A

scala vestibula
scala tympani
scala media (cochlear duct)

35
Q

what chambers of the cochlea contain perilymph?

A

scala vestibuli and scala tympani

36
Q

what chamber of the cochlea contains perilymph?

A

scala media (cochlear duct)

37
Q

what are the two membranes that separate chambers in the cochlea?

A

vestibular and basilar membranes

38
Q

where is the specialized epithelial cells in the cochlea?

A

organ of corti

39
Q

what is the membrane of the organ of corti?

A

tectorial membrane

40
Q

vibrations from the oval window enter into what chamber of the cochlea?

A

scala tympani

41
Q

the vibrations travel in the scala tympani until where?

A

the helicotrema

42
Q

what happens to vibrations at the helicotrema?

A

they get transmitted into the scala vesitbuli

43
Q

what does the pressure wave moving through the scala tympani/vestibuli cause in the organ of corti?

A

pressure wave there too that stimulates nerve ending on end of organ of corti

44
Q

what nerve provides sensory innervation to the tympanic cavity?

A

glossopharyngeal

45
Q

what nerve plexus can be seen in the tympanic cavity? what is it called?

A

tympanic plexus of the glossopharyngeal nerve

46
Q

what is sensation nerve for area around entrance to and the external acoustic meatus?

A

vagus nerve

47
Q

what is sensation on anterior portion of outer ear?

A

trigeminal nerve V3

48
Q

what is sensation on posterior portion of outer ear?

A

facial nerve

Neuro Week 2 (14 decks)

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