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Neuro I > Ear > Flashcards

Ear Flashcards

1
Q

Does chorda tympani run through the middle ear cavity?

Does facial?

A

yes

no

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2
Q

adjacent infection can spread from middle ear to

A

facial nerve

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3
Q

external ear components

A

pinna, external auditory meatus

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4
Q

innervation of the pinna

A

GSA sensory from auriculotemporal (v3)

lesser occipital and great auricular

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5
Q

auricular hematoma

A

trauma to pinna causeing hemorrhaging, if not evacuated and bandaged the scar tissue may grossly deform the auricle
skin tightly adherent to cartilage and bone in ear. can be very painful

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6
Q

blood supply to pinna

A

postirior auricular artery

superficial temporal a

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7
Q

sensory nerve to pinna

A

arnold’s nerve

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8
Q

casual removal of a mass of ear wax may

A

avulse the tympanic membrane and the ossicles

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9
Q

when infected, the furuncle is very painful due to

A

close adherence of skin to the underlying periosteum

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10
Q

tympanic membrane is tilted

A

forward, lateral and downward in the canal

so you can hear steps coming towards you

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11
Q

part of the eardrum that vibrates

A

pars tensa

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12
Q

three layers of tympanic membrane

A

outer epidermis
middle fibrous
inner mucous membrane

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13
Q

pars tensa is

A

fibrous layer in the middle between the epidermis and mucous membrane

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14
Q

outer epidermis of eardrum enervated by

A

GSA fibers from trigeminal and vagus

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15
Q

pars flaccida

A

absence of pars tens a in antero-superior quadrant of tympanic membrane

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16
Q

inner mucous membrane is innervated by

A

GVA fibers of glossopharyngeal nerve via the tympanic plexus

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17
Q

umbo

A

central concavity of tympanic membrane

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18
Q

anterior and posterior mallear folds formed by

what passes through these folds

A

inner mucous membrane on borders of pars flaccid

chorda tympani nerve

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19
Q

Facial nerve in the middle ear

A

NOT in the middle ear cavity, it is in its own bony canal.

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20
Q

ossicles are formed in what branchial arch

A

2nd

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21
Q

tensor tympani m formed from what branchial arch

A

1st arch. in relationship with the malleus and incus

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22
Q

auditory tube can be opened by

A

swallowing

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23
Q

cochlea is _____ to facial nerve

A

anterior

24
Q

facial nerve passes between the

A

chochlea and the semicircular canals in the facial canal.

25
Q

course of the facial nerve

A

leaves brainstem, travels laterally in internal auditory meatus befor entering facial canal
within the canal, geniculate ganglion is located above and medial to the promontory of the middle ear cavity.
at the level of the ganglion, the nerve turns sharply posteriorly and forms the external genu
then courses downward, sends a branch to stapedius m. and exits tstylomastoid foramen

26
Q

muscles of middle ear cavity

A

tensor tympani

stapedius

27
Q

Tensor tympani innervation and function

A

V3

tightens the tympanic membrane and attenuates its vibrations

28
Q

stapedius m innervation and function

A

facial nerve

protective mechanism to prevent excessive movement of stapes due to loud sounds

29
Q

Cochlear division of 8 innervates____

conveys what type of information?

A

the organ of corti (spiral organ)

auditory

30
Q

vestibular division of 8 innervates____

conveys what information?

A

maculae utricle and sacule, and cristae ampullaris

static and dynamic position sense for equlibrium

31
Q

inner ear blood supply

A

labryinthine artery

32
Q

arteriosclerosis of labyrinthine artery

A

may result in vertigo nausea and other inner ear abnormaliteis

33
Q

membraneous labyrinth is suspended in

A

bony structure or canal - bony labyrinth

34
Q

endolymph is found in ______

perilymph is found in ______

A

membranous labyrinth
bony labyrinth
this flud has an anatomic and physiologic distinction

35
Q

semicircular canals are found in

A

bony labyrinth

36
Q

vestibule of bony labyrinth houses

A

utricle and saccule

37
Q

elliptical cavity in vestibule houses

A

utricle

38
Q

spherical cavity in vestibule houses

A

saccule

39
Q

what taps on oval window to set up waves in fluid

A

stapes

40
Q

electrolytes are different in endolymph so they can set up

A

depolarization

41
Q

bone of bony labyrinth covers over the ____ and is extremely hard

A

the membranous labyrinth

42
Q

semicircular ducts ar part of what labyrinth? suspended in?

A

membranous. suspended in semicircular canals of bony labyrinth

43
Q

crista ampulalaris detects

A

angular acceleration

44
Q

utricle and saccule are located in

A

vestibule of osseous labyrinth

45
Q

utricle and saccule are connected to each other

A

by utricle and saccular ducts - join together to form endolymphatic duct

46
Q

macula utricle detects

A

linear acclerateion

47
Q

macula saccule detects

A

low frequency vibrations

48
Q

Helical shaped bony tube similar in shape to the shell of a snail

A

cochlea

49
Q

inside the cochlea is the

A

cochlear duct

50
Q

inside the cochlear duct is the

A

organ of corti

51
Q

bony core of chochlea=

A

modiolus

52
Q

what passes through the modiolus

A

choclear nerve

53
Q

projects from the modiolus like the threads of a screw

A

spiral lamina

54
Q

organ of corti inside

A

the cochlear duct

55
Q

organ of corti contains

A

receptors for hearing

56
Q

hair cells are arranged

A

tonotopically - to be able to respond to certain frequency of sound.

57
Q

prolonged exposure to excessive amounts of nose and or music may lead to

A

partial destruction of the oran of coti. ischemic necrosis may be one of the mechanisms.

Neuro I (30 decks)

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