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neuro exam 2 > ear > Flashcards

ear Flashcards

1
Q

auricle

A

aka pinna

collect air waves and funnel them to EAM

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2
Q

cartilages of auricle

A

all elastic
helix
tragus
antihelix

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3
Q

depressions of auricle

A

concha

scaphoid fossa

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4
Q

lobule of auricle

A

composed of fibroelastic tissue

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5
Q

blood auricle

A

post auricular a, v

superficial temporal a,v

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6
Q

lymp ear

A

mastoid, parotid nodes -> deep cervical nodes

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7
Q

EAM

A

thru tympanic portion temporal bone to tympanic membrane
lat 1/3 cartilaginous
med 2/3 boney

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8
Q

EAM histo

A

lined by stratifies squamous epi w/ceruminous glands

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9
Q

EAM blood

A

post auricular a, v
superficial temporal a,v
deep auricular a

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10
Q

innervation ear

A

great auricular & lesser occipital nn
auriculotemporal V3
VII
X

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11
Q

innervation EAM

A

auriculotemporal V3

X

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12
Q

lymph EAM

A

deep cervical nodes

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13
Q

cartilages of auricle

A

all elastic
helix
tragus
antihelix

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14
Q

depressions of auricle

A

concha

scaphoid fossa

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15
Q

lobule of auricle

A

composed of fibroelastic tissue

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16
Q

blood auricle

A

post auricular a, v

superficial temporal a,v

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17
Q

lymp ear

A

mastoid, parotid nodes -> deep cervical nodes

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18
Q

EAM

A

thru tympanic portion temporal bone to tympanic membrane
lat 1/3 cartilaginous
med 2/3 boney

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19
Q

EAM histo

A

lined by stratifies squamous epi w/ceruminous glands

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20
Q

EAM blood

A

post auricular a, v
superficial temporal a,v
deep auricular a

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21
Q

EAM devleopment

A

derived from arch 1
meatal plug forms from prolif of epi cells, degenerates by month 7
persistence can cause deafness

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22
Q

innervation EAM

A

auriculotemporal V3

X

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23
Q

lymph EAM

A

deep cervical nodes

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24
Q

tympanic membrane

A

convert sound waves into vibrations of middle ear ossicles

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25
Q

structure of tympanic membrane

A

semitransparent, fibroelastic membrane
separates external and middle ear
covered by epidermis externally, mucus membrane internally
directed ant and inf

26
Q

tympanic cavity floor

A

segment of temporal bone separating middle ear from interal jugular v

27
Q

pars falccida

A

sup thin walled portion of tympanic membrane

28
Q

pars tensa

A

inf thick walled portion of tympanic membrane

29
Q

blood tympanic membrane

A

external- deep auricular br of maxillary

internal- ant tympanic br of maxillary

30
Q

innervation of tympanic membrane

A

external auriculotemporal V3 & X

internal IX

31
Q

auricle development

A

derived from mesenchyme of arches 1 & 2
6 auricular hillocks fuse
defects common, associated w/chromosomal syndromes

32
Q

EAM devleopment

A

derived from arch 1
meatal plug forms from prolif of epi cells, degenerates by month 7
persistence can cause deafness

33
Q

tympanic membrane development

A

external epi from ectoderm of cleft 1
middle CT from mesoderm arch 1
internal epi from endoderm of pouch 1

34
Q

middle ear

A

contains tympanic cavity a mucous lined space w/in petrous portion of temporal bone and auditory ossicles

35
Q

fnx of middle ear

A

transfer sound waves from gas to liquid
aplification
protective response to loud sounds via tensor tympani and stapedius mm

36
Q

stapes

A

base- contacts oval window

37
Q

tympanic cavity floor

A

segment of temporal bone separating middle ear from interal jugular v

38
Q

tympanic cavity lat wall

A

tympanic membrane

39
Q

tympanic cavity med wall

A

promontory- cochlea
oval window
round window

40
Q

oval window

A

opens to vestibule of internal ear

contacted by stapes

41
Q

round window

A

opens to scala tympani covered w/thin membrane

pressure release

42
Q

tympanic cavity post wall

A

temporal bone
aditus and antrum- entrance to mastoid antrum
facial canal- for facial n

43
Q

tympanic cavity ant wall

A

opeing for pharyngotympaic tube ans semi canal for passage of tensor tympani

44
Q

pharyngotympanic tube

A

auditory tube
mucous membrane lined tube connecting middle ear and nasopharynx
balances pressure on each side of tympanic membrane
posterolateral 1/3 boney
tensor veli palati can open tube (V3)

45
Q

malleus

A

contacts tympanic membrane creates umbo

46
Q

internal ear

A

housed w/in petrous portion of temporal bone

contains vestibulocochlear organ

47
Q

stapes

A

base- contacts oval window

48
Q

stapedius

A

post wall of tympanic cavity
stapes
dampens mvmt of ossicles
VII SVE

49
Q

tensor tympani

A

cartilaginous part of pharyngotympanic tube
malleus
dampens mvmt occiles
V3 SVE

50
Q

hyperacusis

A

excessive hearing due to loss of dampening mm

51
Q

blood supply to middle ear

A 
inf tympanic a from ascending pharyngeal
ant tympanic a from maxillary
post tympanic from stylomastoid 
sup tympanic from middle meningeal
a of pterygoid canal
vv to pterygoid plexus
52
Q

IX middle ear

A

IX GVA &GVE-P via tympanic br enters via tympaic canaliculus forms tympanic plexus
innervates auditory tube as well
lesser petrosal n forms form plexus and leaves via hiatus

53
Q

VII middle ear

A

SVE to stapedius

54
Q

course of VII

A

enters IAM to course to middle ear, travels in facia canal, gives off chorda tympani and exits middle ear at stylomastoid foramen

55
Q

course of chorda tympani

A

passes btwn incus and mallesu and exits middle ear via petrotympanic fissure
SVA to ant 2/3s tongue
GVE-P to submandibular and sublingual glands

56
Q

middle ear development

A

tympanic cavity and auditory tube form from pouch 1
malleus, incus, and tensor tympanic m from arch 1
stapes and stapedius m from arch 2

57
Q

internal ear

A

housed w/in petrous portion of temporal bone

contains vestibulocochlear organ

58
Q

boney labrinth

A

boney passage w/in temporal bone filled w/perilymph
cochlea
vestibule
semicircular ducts

59
Q

cochlea

A

shell shaped bony structure surrounds cochlear duct
modiolus- central boney cores aroudn which cochlea spiral 2.5 times
spiral lig- anchors cochlear duct to boney wall
osseous spiral lamina- anchors chochlear duct to modiolus

60
Q

vestibule

A

contains utricle and saccule

61
Q

endolymph duct

A

passes thru vestibular aqueduct and ends as endolymphatic sac
matints volume and composition of endolymph fluid

62
Q

inner ear development

A

membranous labyrinth develops from otic placode (ectoderm) -> otic pit -> otic vesicle
boney labyrinth- from surrounding mesenchyme

neuro exam 2 (11 decks)

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