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maris ga 2 > ear quick study > Flashcards

ear quick study Flashcards

1
Q

blood supply to auricle

A

superficial temporal, posterior auricular, occipital

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2
Q

nerve supply to auricle 5

A

great auricular n, auriculo-temporal, lesser occipital, auricular branch of vagus, facial (motor to auricular mucles)

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3
Q

external acoustic meatus lat 1/3 is what and medial 2/3 is what

A

lat 1/2 is cartilage

med 2/3 is bony

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4
Q

blood supply to external acoustic meatus

A

posterior auricular (branch of eca), deep auricular (branch of max), auricular branch of superficial temp a

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5
Q

nerve to external acoustic meatus 2

A

auriculotemporal nerve of V3, and auricular branch of vagus

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6
Q

central depression of tympanic membrane called

A

umbo

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7
Q

cone of light radiates

A

anteroinferiorly

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8
Q

where find cone of light for diff ears

A

right ear: 5 o clock

left ear: 7

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9
Q

what find in anterior superior of tymp membrane

A

anterior malleolar fold and parts of pars flaccida

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10
Q

what find in posterior superior of tymp memb

A

posterior malleolar fold and parts of pars flaccida

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11
Q

what find anterior inferior tymp membe

A

cone of light

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12
Q

what find post inf tymp memb

A

safest site for paracentesis: drain

myringotomy: put tube in ear

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13
Q

blood to tymp memb

A 
deep auricular (branch of max): external surface
internal: stylomastoid branch of post aur a and tympanic branch of max
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14
Q

nerve to tymp mem

A

externally: auriculotemporal nerve and auricular branch of vagus
internally: glossopharyngeal n

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15
Q

the middle ear/tymp cavity communicates with the nasopharynx through the

A

auditory tube

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16
Q

the middle ear/tmp cav communicates with mastoid air cells and mastoid antrum though the

A

aditus

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17
Q

roof of middle ear

A

tegmen tympani

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18
Q

floor of middle ear

A

roof of jugular fossa

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19
Q

anterior wall middle ear

A

incomplete wall, 2 openings: auditory tube and tensor tympani muscle

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20
Q

posterior wall middle ear

A

mastoid wall that has aditus,

opening of facial canal, and pyramid process in it

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21
Q

medial wall of middle ear is also the

A

lateral wall of the inner ear

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22
Q

whats in medial wall of mid ear

A

promontory
oval window
round window

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23
Q

oval window aka

A

fenestra vestibuli

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24
Q

round window aka

A

fenestra cochleae

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25
Q

lateral wall mid ear

A

tympanic membrane

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26
Q

what is the function of the pyramid process

A

attachment for stapedius muscle

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27
Q

facial nerve enters petreous portion of temp bone through the () and exits facial canal through the ()

A

internal acoustic meatus

stylomastoid foramen

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28
Q

if you have a lesion of facial nerve b/f it enters auditory meatus s&s

intracranial

A

paralysis of muscles of facial expression

hyperacusis (cause of paralysis of stapedius muscle)

loss of taste of anterior 2/3 of tongue: hypoageusia

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29
Q

if lesion of facial nerve after stylomatoid foramen see what

extracranial

A

paralysis of muscles of facial expression

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30
Q

incus-mallear jt is a () jt

A

saddle

31
Q

incus stapes jt is a () jt

A

ball and socket jt

32
Q

nerve to tensory tympani muscle

A

nerve to medial pterygoid

33
Q

action of tensor tympani

A

draws tympanic membrane medially increasing its tension thus lessening sound transmission

34
Q

stapedius muscle nerve

A

facial nerve

35
Q

action of stapedius

A

damps down vibratiosn by pulling the head of stapes posteriorly (protective mechanism)

36
Q

how long is auditory tube/pharygotympanic/eustachian

A

3.5-4cm long

37
Q

function of auditory tube

A

equalize pressure on both sides

38
Q

what do if in plane and try to equalize pressure

A

as go up atmosphere pressure goes down so yawn or chew gum cause our pressure in ear is higher

39
Q

when go scuba do what to eqaulise pressure

A

blow nose

40
Q

herpes zoster auticus affects what

A

opthlamic divison of trigeminal or auricuotemporal so get lesions on face or ear

41
Q

where is inner ear

A

petrous portionof temporal bone

42
Q

what is suspended in the bony labrinth

A

membranous labryinth

43
Q

what is the membranouse labyrinth fileld with

A

endolymph

44
Q

what separates the membranous from the bony labyrinth

A

perilymph

45
Q

what is bony labyrinth made of

A

cochlea, vestibule semicircular canals

46
Q

what is the membranous labyrinth made of

A

utricle, saccule, semicircular ducts (in canals) and cochlear duct (in cochlea)

47
Q

what is in the vestibule

A

utricle and saccule

48
Q

what contains the sensory e.t cells for hearing

A

organ of corti/spiral organ

49
Q

how many turns does cochlea make

A

2 1/2

50
Q

the bony core of cochlea

A

modiolus

51
Q

modiolus contains

A

spiral gangli

52
Q

the thread of bone around modiolus

A

osseous spiral lamina

53
Q

what divides the cochlea into 3 division

A

basilar and vestibular membranes

54
Q

what are the 3 divisions of the cochlea

A

upper: scala vestibule
lower: sacala tympani
middle: coclear duct

55
Q

what are both the scala vestibule and tympani filled wtih

A

perilymph

56
Q

the scala vest and tymp connect at the apex through the ()

A

helicotrema

57
Q

the scala vest ends at the () and the scala tymp ends at ()

A

oval window (closed by stapes base)

tymp: round window closed by 2nd tymp membrane

58
Q

cochlear duct is filled wtih

A

endolymph

59
Q

what is ontop of basilar membrane

A

organ of corti

60
Q

what is on top of organ of corti

A

tectorial membrane

61
Q

what is imbedded in tectorial emmbrane

A

cilia (hair)

62
Q

what forms cochlear nere

A

axons of the bipolar nerve cells from organ of corti

63
Q

the vestibule is contiunsous anteriorly by the () and posteriorly by the () and posterior cranial fossa through the ()

A

cochlea

post: semicircular canals

fossa : aquadeuct of vestibule

64
Q

spot of modified sensory e.t. in utricle called

A

macula utriculi

65
Q

spot of modified sensory e.t in saccule

A

macula sacculi

66
Q

otoliths

A

calcium crystals for when go up and down bend cilia to get action potential

67
Q

function of macula sacculi and utriculi

and innervation of htem

A

detect acceleration and deceleration, static equilibrium and head in space

vestibular division of cranial 8 vestibulocochlear

68
Q

sensory organ found in ampulla of circular ducts

A

crista ampullaris (innervated nerve 8)

69
Q

function of cristae

A

kinetic equilibrium, and rotational acceleratioand nd deceleration

70
Q

what passes through internal acoustic meatus

A

facial, vestibulocochlear

internal acoustic a. (branch of basilar)

71
Q

where is primary auditory cortext

A

superior temporal gyrus

72
Q

conductive deafness

A

problem from outer ear to ossicles (like artirist of bones or blockage from earwax)

73
Q

presbycusis

A

loss of hearing secondary to old age

74
Q

sensory neural deafness

A

damage of spiral oran

maris ga 2 (8 decks)

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