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Flashcards in Ear Deck (57):
1

Does chorda tympani run through the middle ear cavity?
Does facial?

yes
no

2

adjacent infection can spread from middle ear to

facial nerve

3

external ear components

pinna, external auditory meatus

4

innervation of the pinna

GSA sensory from auriculotemporal (v3)
lesser occipital and great auricular

5

auricular hematoma

trauma to pinna causeing hemorrhaging, if not evacuated and bandaged the scar tissue may grossly deform the auricle
skin tightly adherent to cartilage and bone in ear. can be very painful

6

blood supply to pinna

postirior auricular artery
superficial temporal a

7

sensory nerve to pinna

arnold's nerve

8

casual removal of a mass of ear wax may

avulse the tympanic membrane and the ossicles

9

when infected, the furuncle is very painful due to

close adherence of skin to the underlying periosteum

10

tympanic membrane is tilted

forward, lateral and downward in the canal
so you can hear steps coming towards you

11

part of the eardrum that vibrates

pars tensa

12

three layers of tympanic membrane

outer epidermis
middle fibrous
inner mucous membrane

13

pars tensa is

fibrous layer in the middle between the epidermis and mucous membrane

14

outer epidermis of eardrum enervated by

GSA fibers from trigeminal and vagus

15

pars flaccida

absence of pars tens a in antero-superior quadrant of tympanic membrane

16

inner mucous membrane is innervated by

GVA fibers of glossopharyngeal nerve via the tympanic plexus

17

umbo

central concavity of tympanic membrane

18

anterior and posterior mallear folds formed by
what passes through these folds

inner mucous membrane on borders of pars flaccid
chorda tympani nerve

19

Facial nerve in the middle ear

NOT in the middle ear cavity, it is in its own bony canal.

20

ossicles are formed in what branchial arch

2nd

21

tensor tympani m formed from what branchial arch

1st arch. in relationship with the malleus and incus

22

auditory tube can be opened by

swallowing

23

cochlea is _____ to facial nerve

anterior

24

facial nerve passes between the

chochlea and the semicircular canals in the facial canal.

25

course of the facial nerve

leaves brainstem, travels laterally in internal auditory meatus befor entering facial canal
within the canal, geniculate ganglion is located above and medial to the promontory of the middle ear cavity.
at the level of the ganglion, the nerve turns sharply posteriorly and forms the external genu
then courses downward, sends a branch to stapedius m. and exits tstylomastoid foramen

26

muscles of middle ear cavity

tensor tympani
stapedius

27

Tensor tympani innervation and function

V3
tightens the tympanic membrane and attenuates its vibrations

28

stapedius m innervation and function

facial nerve
protective mechanism to prevent excessive movement of stapes due to loud sounds

29

Cochlear division of 8 innervates____
conveys what type of information?

the organ of corti (spiral organ)
auditory

30

vestibular division of 8 innervates____
conveys what information?

maculae utricle and sacule, and cristae ampullaris
static and dynamic position sense for equlibrium

31

inner ear blood supply

labryinthine artery

32

arteriosclerosis of labyrinthine artery

may result in vertigo nausea and other inner ear abnormaliteis

33

membraneous labyrinth is suspended in

bony structure or canal - bony labyrinth

34

endolymph is found in ______
perilymph is found in ______

membranous labyrinth
bony labyrinth
this flud has an anatomic and physiologic distinction

35

semicircular canals are found in

bony labyrinth

36

vestibule of bony labyrinth houses

utricle and saccule

37

elliptical cavity in vestibule houses

utricle

38

spherical cavity in vestibule houses

saccule

39

what taps on oval window to set up waves in fluid

stapes

40

electrolytes are different in endolymph so they can set up

depolarization

41

bone of bony labyrinth covers over the ____ and is extremely hard

the membranous labyrinth

42

semicircular ducts ar part of what labyrinth? suspended in?

membranous. suspended in semicircular canals of bony labyrinth

43

crista ampulalaris detects

angular acceleration

44

utricle and saccule are located in

vestibule of osseous labyrinth

45

utricle and saccule are connected to each other

by utricle and saccular ducts - join together to form endolymphatic duct

46

macula utricle detects

linear acclerateion

47

macula saccule detects

low frequency vibrations

48

Helical shaped bony tube similar in shape to the shell of a snail

cochlea

49

inside the cochlea is the

cochlear duct

50

inside the cochlear duct is the

organ of corti

51

bony core of chochlea=

modiolus

52

what passes through the modiolus

choclear nerve

53

projects from the modiolus like the threads of a screw

spiral lamina

54

organ of corti inside

the cochlear duct

55

organ of corti contains

receptors for hearing

56

hair cells are arranged

tonotopically - to be able to respond to certain frequency of sound.

57

prolonged exposure to excessive amounts of nose and or music may lead to

partial destruction of the oran of coti. ischemic necrosis may be one of the mechanisms.