Ear Flashcards

1
Q

another name for auditory tube?

A

pharyngotympanic tube

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2
Q

three parts of the external ear? features within the first one?

A

auricle/pinna: helix, antihelix, tragus, antitragus, concha, lobule, scaphoid fossa
external acoustic meatus
tympanic membrane

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3
Q

SA info to outer ear by? what about concha and EAM

A

auriculotemporal n (V3) + greater auricular n (C2-3) + lessor occipital n (C2-3)

CNVII + auricular branch of CNX + small component CNIX

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4
Q

blood supply to auricle + EAM?

A

posterior auricular art + superficial temporal art

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5
Q

lymph drainage of auricle + EAM?

A

superficial parotid LN + mastoid LN + deep cervical LN + superficial cervical LN

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6
Q

innervation of ext vs. int tympanic membrane (SA)

A

autriculotemporal n + auricular branch of CNX (some CNIX) vs. CNIX

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7
Q

order of membranes + auditory ossicles from ext -> int

A

tympanic membrane -> malleus -> incus -> stapes -> oval window

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8
Q

6 walls of the middle ear cavity, where do you find chorda tympani? tympanic plexus?

A

anterior: cartoid
posterior: mastoid
lateral: membranous (chorda tympani CNVII)
medial: labyrinthine (tympanic plexus CNIX on promontory)
roof: tegmental
floor: jugular

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9
Q

which muscle attaches to handle of malleus? innervated by? head of malleus extends to ___?

A

tensor tympani, V3, epitympanic recess

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10
Q

where do you find lesser petrosal in relation to promontory

A

superiorly

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11
Q

posterior wall of middle ear has an opening called __ that leads into a chamber called __ lined by ___. This wall also contains the __ ,which accommodates __, and terminates as the __

A
aditus
mastoid antrum
mastoid air cells
facial canal
facial n
stylomastoid foramen
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12
Q

stapedius innervated by?

A

CNVII

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13
Q

which cavities are associated w bony labyrinth? what lines it? what does the spiral canal of cochlea turn around? how does bony labyrinth communicate w subarachonid space?

A

cochlea, vestibule, semicircular canals
otic capsule
modiolus
cochlear aqueduct

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14
Q

vestibule contains the __ & __, and is continuous with the cranial fossa by the __, which transmits the ___ duct. each semicircular canal has a __ at one end, only has 5 instead of 6 openings because __ and __ share a common limb

A
utricle, saccule
vestibular aqueduct
endolymphatic
bony ampulla
ant + post
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15
Q

membranous labyrinth contains __ which differs from ___, which 3 structures associated with it?

A

endolymph (similar to ICF), perilymph (similar to ECF)

vestibular labyrinth, cochlear labyrinth, semicircular ducts

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16
Q

semicircular ducts open into __, which communicates w ___ via ___ duct, they respond to ___ mov’t. they are continuous w the cochlear duct via ___ . saccule + utricle have specialized areas called __ that respond to ___ acceleration, semicircular ducts has sensory area called ___, they relay info to the __ ganglion

A
utricle (more horizontal)
saccule (vertical)
utriculosaccular duct
angular accelerations
ductus reunions
maculae
linear
ampullary crest
vestibular
17
Q

cochlear duct is suspended between __ on the external wall and __ of the modiolus. apex of cochlear duct is __, waves created in periymph ascend to apex via __, pass back via ___

A
spiral ligaments
osseous spiral lamina
helicotrema
scala vestibuli
scala tympani
18
Q

roof of the cochlear duct formed by __ membrane, floor formed by __ membrane, on top are receptors are called __ overlaid by the __ membrane.

A

vestibular
basilar
spiral organ of Corti
tectorial

19
Q

internal acoustic meatus allows for passage of which nerves and which artery?

A

CNVII, CNVIII (vestibular and cochlear n branches), internal auditory/labyrinthine artery

20
Q

what clinical correlate is associated w suppressed development of auricular hillocks

A

microtia