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Flashcards in ear anatomy Deck (40):
1

what is the pterion?

thinnest part of skull, H shaped suture between frontal bone, temporoal bone and sphenoid

2

2 parts to temporal bone?

petrous and squamous

3

auricle to tympanic mambrane

external ear

4

tympanic membrane to oval window

middle ear

5

oval window to internal acoustic meatus

internal ear

6

amplifies and conducts sound

middle ear

7

where are the ossicles

middle ear

8

where is the eustachian tube

middle ear

9

what type of cartilage in external ear?

elastic

10

what comes out of ceruminous glands?

ear wax

11

what is the auricle?

the part of the ear wee see outside

12

what nerve gives sensory supple to the helix and lope and most of posterior auricle?

C2, C3 spinal nerves

13

what nerve supples the rest of the outer auricle?

CN V3(mandibular)

14

what 2 nerves supply ther external canal?

CN V3
CN X (vagus)

15

what nerve supplied the collecting bit of auricle before the sound enterss the canal?

vagus and also facial

16

lateral surface of superior half of auricle drain to what lymph nodes?

parotid

17

cranial surface of superior half drain to what nodes?

mastoid (and deep cervical)

18

rest of auricle and lobe drain to which nodes?

superficial cervical nodes

19

all lymph from auricle eventually drains to?

deep cervial nodes, thoracic duct and venous angle

20

what is an otoscopic examination?

looking at external acoustic meatus and tympanic membrane

children pull back and down
adults-pull back and up

21

most depressed part of tympanic membrane?

umbo

22

general sensory supply to external ear drum?

CN V3 (mostly)

23

general sensory supply to external ear drunm?

CN IX glossophyarngeal

24

general sensory supply to middle ear cavity, eustachian tube, nasopharynx, orophyarnx, tonsils

CN IX glossopharyngeal

25

connects middle ear to nasopharynx

eustachian tube

26

name the 3 ossicles

malleus
incus
stapes (stirrup)

27

what created the umbo?

handle of malleus

28

describe course of facial nerve?

connects to CNS at junction between pons and medulla.
travels in internal acoustic meatus in posterior cranila fossa. in base of skull in temporal bone (petrous part) in internal acoustic meatus and stylomastoid foramen

29

gives taste to anterior 2/3rd tongue and parasympathetcis supply to submandibular and sublingual and salivary glands

chorda tympani branch of facial nerve

30

thinnest skeletal muscle in body?

strapedius

31

function of starpedius?

reduces stapes movement to pretect internal ear against excessive noise

32

what does tensor tympani do?

dampens the sound of chewing

33

muscle on forehead

frontalis

34

muscled around eyes

orbicularis oculi

35

2 parts of CN VIII

cochlear part-hearing
vestibular part-balance

36

what does the otic capsule contain?

bony labyrinth which is fluid filled (perilymph)

37

what is suspended in the perilymph of the bony labryrinth?

membranous labyrinth, communicating sacs and ducts and endolymph

38

semiciruclar canals are part of the...?

vestibular apparatus

39

snail looking thing

cochlea

40

describe course of vestibulocochlear nerve/

connects at brain stem between pons and medulla
travels in internal acoustic meatus