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Anatomy and Radiology Test 3 > The Ear > Flashcards

The Ear Flashcards

1
Q

Bony labyrinth

A

Inner ear network of cavities

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2
Q

Bony labyrinth divisions

A

Cochlea
Central vestibule
3 semicircular cnal

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3
Q

All cavities of bony labrynth contain

A

Perilymph fluid

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4
Q

Perilymph fluid

A

High Na, low K

In bondy labyrinth

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5
Q

Inner ear found

A

In petrous ridfe of temporal boine

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6
Q

Membranous labyrnth surrounded by

A

Bony

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7
Q

Membranous labyrinth filled with ____ and concentration

A

Endolympth (low Na, High K)

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8
Q

Membranous labyrinth divides _______ into _______

A

Bony vestibule into utricle and saccule

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9
Q

Utricle and saccule contain

A

Maculae (sensory organs)

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10
Q

Cristae ampularis

A

Sensory organs of the semicircular canals

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11
Q

Auricle function

A

Connect pressure waves and funnel into external acoustic meatus

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12
Q

Sound waves cause________

A

Tympanic membrane to vibrate

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13
Q

Parts of extenral ear

A

Pinna
External acoustic meatus
External tympanic membrane

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14
Q

Tympanic membrane concavity

A

Toward external acoustic meatus

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15
Q

Umbo

A

Center of depression of membrane…reflects bright lights

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16
Q

Which bone fuses to tympanic membrane

A

Malleus

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17
Q

Pars tensa of tym memb

A

Larger protion below malleolar fold

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18
Q

Pars flaccida of tym memb

A

Small part above malleolar fold

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19
Q

Chorda tympani runs in middle ear deep to

A

Pars flaccida of tym mem

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20
Q

Middle ear

A

Air filled cavity deep to tymp membrane

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21
Q

Middle ear contents

A

Ossicles
Stepdius and tensor tymp msucles
Chorda tympani nerve
Tymp plexus of nerves

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22
Q

Tympanic cavity proper

A

Middle ear space directly behind tympanic membrane

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23
Q

Epitympanic recess

A

Middle ear space superior and behind

24
Q

Lateral wall of middle ear

A

Tympanic membrane

25
Medial wall of membrane
Prom of coch Oval/round window Tym plexus Prom of facial canal
26
Tympanic plexus
Tympanic nerve (from CN 9) divides into branches...Innervate mucosa of middle ear..also produces lesser petrosal that provide autonomics to parotid
27
Ossicles transmit sounds
From air to cochlea
28
Malleus attaches to
Tym mem
29
Incus articulate with
Malleus in the epitympanic recess
30
Stapes articulates
With incus and fuses to oval window covering entrance to inner ear
31
Roof of middle ear
Tegmen tympani - thin bone separating middle ear from middle cranial fossa
32
Floor of middle ear
THin bone separating middle ear cavity from IJV
33
Epitympanic recess communicates with _____ posteriorly
Mastoid air cells
34
Stapedius function and innervation
CN 7 | Dampens movement of loud sounds
35
Chorda tympani passes
Lateral wall between malleus and incus...exits via petrotympanic fissure into IT fossa
36
Auditory tube
How middle ear communicates anteriorly with nasopharynx
37
Tensor tympani passes with, function, innervation
Pharyngeotympanic tube from anterior to insert on malleus Dampens malleus during loud sounds V3 of CN 5
38
Modiolus
Central bony core of labyrinth | Supports spiral ganglion of CN 8
39
Spiral lamina
Projects from modiolis and divides bony cochlea
40
Base of cochlea
Closest to oval windowq
41
Apex of cochlea
At top of spiraled cochlea
42
What forms cochlear duct
Vestibular (roof) and basilar membrane (floor)
43
Cochlear duct is
CLosed sac that spirals up the cochlea but doesn't reach the end
44
Cochlear duct filled with
Endolymph
45
Sacala vesibuli
Duct above vestibular membrane
46
Scala vestibuli continuous with
Sacala tympani that lies below basilar membrane
47
3 ducts of inner ear orinetation
Parallel
48
Organ of corti
Auditory sensory organ
49
Basilar membrane supports
Organ of corti
50
Organ of corti composed of
Hair cells and supporting cells
51
How is cranial nerve 8 depolarized
Movement of hair cells
52
Stapes transmits sounds into
Sacala vestibuli
53
How does sound wave escape cochlea?
Round window
54
Basilar membrane resonance
Differences in width and thickness allow for specific frequencies
55
Locations of frequences of basilar membrane
CLose to base - higher frequency and thicker
56
Basilar membrane organizes sound into a
Topographic place code along length called a tonotopic map
57
Path of tympanic nerve
Runs to tympanic plexus, becomes lesser petrosal, through hiatus, through foramen ovale to IT fossa, synapse in otic ganglion, run to parotid gland with auriculotemporal nerve

Anatomy and Radiology Test 3 (11 decks)

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