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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
Q

Medial wall of membrane

A

Prom of coch
Oval/round window
Tym plexus
Prom of facial canal

26
Q

Tympanic plexus

A

Tympanic nerve (from CN 9) divides into branches…Innervate mucosa of middle ear..also produces lesser petrosal that provide autonomics to parotid

27
Q

Ossicles transmit sounds

A

From air to cochlea

28
Q

Malleus attaches to

A

Tym mem

29
Q

Incus articulate with

A

Malleus in the epitympanic recess

30
Q

Stapes articulates

A

With incus and fuses to oval window covering entrance to inner ear

31
Q

Roof of middle ear

A

Tegmen tympani - thin bone separating middle ear from middle cranial fossa

32
Q

Floor of middle ear

A

THin bone separating middle ear cavity from IJV

33
Q

Epitympanic recess communicates with _____ posteriorly

A

Mastoid air cells

34
Q

Stapedius function and innervation

A

CN 7

Dampens movement of loud sounds

35
Q

Chorda tympani passes

A

Lateral wall between malleus and incus…exits via petrotympanic fissure into IT fossa

36
Q

Auditory tube

A

How middle ear communicates anteriorly with nasopharynx

37
Q

Tensor tympani passes with, function, innervation

A

Pharyngeotympanic tube from anterior to insert on malleus
Dampens malleus during loud sounds
V3 of CN 5

38
Q

Modiolus

A

Central bony core of labyrinth

Supports spiral ganglion of CN 8

39
Q

Spiral lamina

A

Projects from modiolis and divides bony cochlea

40
Q

Base of cochlea

A

Closest to oval windowq

41
Q

Apex of cochlea

A

At top of spiraled cochlea

42
Q

What forms cochlear duct

A

Vestibular (roof) and basilar membrane (floor)

43
Q

Cochlear duct is

A

CLosed sac that spirals up the cochlea but doesn’t reach the end

44
Q

Cochlear duct filled with

A

Endolymph

45
Q

Sacala vesibuli

A

Duct above vestibular membrane

46
Q

Scala vestibuli continuous with

A

Sacala tympani that lies below basilar membrane

47
Q

3 ducts of inner ear orinetation

A

Parallel

48
Q

Organ of corti

A

Auditory sensory organ

49
Q

Basilar membrane supports

A

Organ of corti

50
Q

Organ of corti composed of

A

Hair cells and supporting cells

51
Q

How is cranial nerve 8 depolarized

A

Movement of hair cells

52
Q

Stapes transmits sounds into

A

Sacala vestibuli

53
Q

How does sound wave escape cochlea?

A

Round window

54
Q

Basilar membrane resonance

A

Differences in width and thickness allow for specific frequencies

55
Q

Locations of frequences of basilar membrane

A

CLose to base - higher frequency and thicker

56
Q

Basilar membrane organizes sound into a

A

Topographic place code along length called a tonotopic map

57
Q

Path of tympanic nerve

A

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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