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Flashcards in Ear Deck (82):
1

3 divisions of the ear

External, middle, inner

2

Parts of the external ear

auricle and external auditory canal

3

Deepest depression of the pinna that leads toward the ear canal

Concha

4

Outer rim of the pinna

Helix

5

Tongue-like flap, anterior to the ear canal

tragus

6

Blood supply to the pinna

superficial temporal and posterior auricular arteries

7

Nerves to the pinna

Great auricular and auriculotemporal nerves

8

2.5 cm long tube between the auricle and the tympanic membrane

External auditory canal

9

Outer 1/3rd of external auditory canal is formed by what?

Cartilage

10

Inner 2/3rds of external auditory canal is formed by what?

bone

11

How do you straighten the external auditory canal?

Pull superoposterior on auricle

12

Another name for ear wax

cerumen

13

Blood supply for external auditory canal

superficial temporal, posterior auricular, and deep auricular arteries

14

Nerves to the external auditory canal and outer surface of tympanic membrane

Auriculotemporal nerve, with some vagus nerve

15

The petrous part of the temporal bone that contains the auditory ossicles, 2 muscles, and nerves

Middle ear cavity

16

What separates the middle ear cavity and external auditory canal?

Tympanic membrane

17

Spaces of the middle ear cavity

Tympanic cavity, epitympanic recess

18

What does the middle ear cavity communicate with and how?

Mastiod air cells via the aditus and antrum, and the pharynx via auditory tube

19

Innervation of mucosa of middle ear cavity

Tympanic plexus, mostly glossopharyngeal

20

What nerve carries pain associated with otitis media?

glossopharyngeal

21

Roof of middle ear cavity

Tegmen tympani

22

Floor of middle ear cavity

Jugular wall

23

What does the jugular wall separate?

Middle ear cavity and superior bulb of IJV

24

What passes thru the jugular wall?

Tympanic nerve

25

Medial wall of middle ear cavity

Labyrinthine wall

26

What 2 important structures are associated with the promontory of the labyrinthine wall?

Tympanic plexus covers and is formed by the basal coil of the cochlea

27

Windows in the laybyrinthine wall

Superior: Oval, Inferior: round

28

What is superoposterior to the oval window?

Facial nerve canal prominence

29

Superior to the facial nerve prominence

Prominence of the lateral semicircular canal

30

Most anterior part of the laybrinthine wall contains what?

Chochleariform process and semicanal for tensor tympani

31

What primarily forms the lateral wall of the middle ear cavity?

Tympanic membrane

32

Innervation of tympanic membrane

Auriculotemporal on outer surface, vagus nerve for outer/posteroinferior surface, tympanic plexus on inner surface

33

Apex of the concavity of the tympanic membrane

Umbo

34

Where does the tip of the handle of the malleus attach?

Umbo

35

Where are the mallear folds/the portion without a firbous core in the tympanic membrane?

Flaccid part

36

Lower part of the tympanic membrane

Tense part

37

The reflection of light from the umbo that is seen by using an otoscope

Cone of light

38

What does the carotid wall separate?

Middle ear and ICA

39

What makes up the anterior wall of the middle membrane?

Carotid wall

40

What opening does the carotid wall contain?

Opening for autditory (pharyngotympanic) tube

41

What nerves run thru the carotid wall?

Tensor tympani and chorda tympani

42

What makes up the posterior wall of the middle ear cavity?

Mastiod wall

43

What does the mastiod wall separate?

the middle ear and the mastiod air cells

44

What connects the mastiod air cells to the middle ear cavity?

(superiorly) aditus leading to the mastiod antrum

45

What contains the stapedius muscle?

the pyramid

46

Where do the contents of the prominence of the facial nerve emerge in the middle ear?

The nerve to the stapedius and chorda tympani distrubute off of the mastiod wall

47

From lateral to medial, what are the auditory ossicles?

Malleus, incus, stapes

48

Parts of the malleus

head, neck, handle, lateral/anterior processes

49

What nerve runs on the medial surface of the root of the malleus handle?

chorda tympani

50

Parts of the incus

Body, short/long processes, lenticular process

51

What part of the incus articualtes with the stapes?

lenticular process

52

Parts of the stapes

Head, neck, 2 limbs, ovoid base

53

Where does the stapes connect to the labyrinthine wall?

Oval window and membrane

54

Where does the tensor tympani turn?

cochleariform process

55

Where does the tensor tympani insert?

Handle of the malleus to tense the tympanic membrane

56

What large bones does the tensoe tympani attach to?

Semicanal, cartilage of the auditory tube, greater wing of the sphenoid

57

What innervates the tensor tympani?

Mandibular nerve

58

Where does the stapedius muscle insert?

Neck of the stapes

59

What innervates the stapedius muscle?

Facial nerve

60

How is the tympanic plexus formed

The tympanic nerve branches off of the glosspharyngeal nerve, enters middle ear via floor, form plexus on the promontory

61

Preganglionic parasympathetic fibers in the tympanic nerve

Form the lesser petrosal nerve to the otic ganglion

62

What ganglion is in the petrous bone near the middle ear?

Geniculate ganglion

63

3 nerves off of the geniculate ganglion

Greater petrosal nerve, nerve to stapedius, chorda tympani

64

Complicated series of spaces inside the petrous part of the temporal bone

Bony labyrinth

65

Lines the bony labyrinth

Membranous labyrinth

66

Communication b/t cochlear labyrinth and subarachnoid space

Cochlear aqueduct

67

Communication b/t vestibular membranous labyrinth and endolymphatic sac

Vestibular aqueduct

68

Snail-shaped organ for audition

Cochlea

69

Spiral bony core of cochlea

Modiolus

70

Chamber that begins at the oval window and spirals to the apex

Scala Vestibuli

71

Chamber that begins at the apex and spirals to the round window

Scala tympani

72

How do the 2 chambers communicate?

Helicotrema

73

Fills the 2 chamber space

perilymph

74

Middle chamber of cochlea

Cochlear duct

75

Fills the cochlear duct

endolymph

76

Organ for hearing

Spiral organ of Corti

77

Course of neurons from cochlea to brain stem

Hair cells, sensory fibers converge to spiral ganglion, cochlear nerve, vestibulocochlear nerve

78

Why would a lesion in the external autitory canal cause nausea/vomiting?

vagus nerve and gag reflex

79

Detects head tilt/translational accelerations

Sacs of the vestibular apparatus

80

2 sacs of vestibular apparatus

Utricle and saccule

81

Detects rotational accelerations

Lateral/anterior/posterior semicircular canals of the vestibular apparatus

82

Formation of cell bodies from the vestibular apparatus

Vestibular ganglion