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809 - Exam 1 > The Ear - B Davis Lec 1 > Flashcards

The Ear - B Davis Lec 1 Flashcards

1
Q

function of auricle

A

sound collection and localization

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2
Q

sensory innervation to concha

A

auricular branch of CN X

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3
Q

sensory innervation to anterior aspects including tragus

A

auriculotemporal nerve (V3)

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4
Q

sensory innervation to variable, small distribution pattern

A

posterior auricular branch of CN VII

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5
Q

sensory innervation to posterior aspect of auricle aka lateral surfaces of lobule, helix, and anti-helix

A

Great Auricular Nerve (branch of cervical plexus)

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6
Q

sensory innervation to posterior aspect of auricle aka medial surfaces of lobule, helix, and anti-helix

A

Lesser Occipital Nerve (branch of cervical plexus)

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7
Q

innervation to external ear canal

A

auriculotemporal nerve (V3) and CN X

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8
Q

innervation to internal tympanic membrane

A

CN IX

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9
Q

what is the boundary between the external and middle ear

A

tympanic membrane

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10
Q

the tympanic membrane is anchored to the

A

manubrium of malleus

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11
Q

the middle hear houses:

A

3 tiny ossicles
chorda tympani (VII)
tensor tympani M
stapedius M
tympanic plexus (IX)

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12
Q

boundaries of middle ear

A

floor (inferior): tympanic portion of temporal bone
anterior: auditory/eustachian tube
lateral: tympanic membrane
posterior: mastoid air cells
medial: promontory of inner ear
roof (superior): tegmen tympani

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13
Q

the middle ear develops as an out-pocketing of the _________ , and retains this connection via the ______________-

A

pharynx , eustachian tube

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14
Q

Middle Ear: anterior communication

A

Eustachian tube to nasopharynx

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15
Q

Middle Ear: posterior communication

A

mastoid antrum

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16
Q

Middle Ear: medial communication –> oval window

A

footplate of stapes ; scala vestibuli

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17
Q

Middle Ear: medial communication –> round window

A

pressure release from scala tympani

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18
Q

the internal surface of tympani membrane is supplied by the ____________ from __________-

A

tympanic plexus ; CN IX

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19
Q

The tympanic nerve from CN IX is composed of

A

preganglionic parasympathetic and somatic sensory fibers

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20
Q

the tympanic nerve continues through the plexus to enter the cranial cavity as the

A

lesser petrosal nerve

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21
Q

the lesser petrosal nerve leaves through the

A

foramen ovale

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22
Q

the lesser petrosal nerve synapses at the

A

otic ganglion

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23
Q

lesser petrosal nerve postganglionic parasympathetic fibers hitchhike on the ____________ to innervate the ___________

A

auriculotemporal nerve (V3) ; parotid gland

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24
Q

what function do the preganglionic parasympathetic fibers have in the middle ear cavity

A

none

25
Q

function of the ossicles

A

levers to magnify sound vibrations from the tympanic membrane to oval window of middle ear

26
Q

the ossicles develop from which arches

A

1st and 2nd

27
Q

stapes transmits sound waves from the ___________ to the __________ via the oval window

A

middle ear ; inner ear

28
Q

the malleus does what when the membrane receives sound waves

A

vibrates

29
Q

the incus transfers vibrations from the

A

malleus to stapes

30
Q

the stapes receives vibrations from

A

incus

31
Q

the stapes transfers vibrations via the footplate of the __________ of the ____________

A

oval window ; inner ear (scala vestibuli)

32
Q

the facial nerve passes through the internal acoustic meatus with CN

A

VII

33
Q

the geniculate ganglion houses what neuron bodies

A

1st order sensory neuron bodies

34
Q

what nerve branches at the geniculate ganglion

A

greater petrosal nerve

35
Q

the greater petrosal nerve carries what fibers and towards what ?

A

preganglionic parasympathetic fibers ; ptergopalatine ganglion

36
Q

the facial nerve exits the base of the skull through the

A

stylomastoid foramen

37
Q

what 2 nerves branch off the facial nerve in the facial canal

A

nerve to stapedius
chorda tympani

38
Q

the chorda tympani passes between the

A

incus and malleus

39
Q

the chorda tympani carries what fibers

A

taste fibers (anterior 2/3 of tongue)

preGPS fibers to submandibular ganglion

40
Q

the chorda tympani merges with what nerve

A

the lingual nerve

41
Q

the tensor tympani muscle does what

A

dampens excessive vibrations

42
Q

the tensor tympani is innervated by the

A

CN V3

43
Q

the stapedius muscle is innervate by

A

CN VII

44
Q

the stapedius muscle does what

A

restricts movement

dampens vibration from loud noise

45
Q

lesions that paralyze either the tensor tympani muscle or stapedius muscle can result in what

A

hyperacusis aka hypersensitivity to sound

46
Q

the bony labyrinth is filled with what fluid

A

perilymph

47
Q

the perilymph drains into the subarachnoid space via

A

the cochlear aqueduct

48
Q

the oval window is occupied by

A

stapes footplate

49
Q

the oval window receives vibrations into

A

scala vestibuli

50
Q

the round window dissipates vibrations from

A

scala tympani

51
Q

the membranous labyrinth contains what fluid

A

endolymph

52
Q

endolymph drains into a sac in the subarachnoid space via the

A

vestibular aqueduct

53
Q

the membranous labyrinth contains what 2 receptor organs for hearing and balance

A

cochlea and vestibular apparatus

54
Q

the scala vestiboli and scala tympani communicate with one another at the

A

helicotrema

55
Q

the vestibular apparatus is a region of membranous labyrinth for detection of

A

balance
position
movement

56
Q

the inflated region near the cochlea in the vestibular apparatus houses the ______ and _______-

A

utricle and saccule

57
Q

the utricle monitors what kind of balance

A

static balance - horizontal acceleration

58
Q

the saccule monitors what kind of balance

A

static balance - vertical acceleration

59
Q

the semicircular canals monitor what kind of balance

A

kinetic (angular movement of head on the APL planes aka rotational)

809 - Exam 1 (8 decks)

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