ear anatomy

Question 1

what is the pterion?

Answer 1

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

Question 2

2 parts to temporal bone?

Answer 2

petrous and squamous

Question 3

auricle to tympanic mambrane

Answer 3

external ear

Question 4

tympanic membrane to oval window

Answer 4

middle ear

Question 5

oval window to internal acoustic meatus

Answer 5

internal ear

Question 6

amplifies and conducts sound

Answer 6

middle ear

Question 7

where are the ossicles

Answer 7

middle ear

Question 8

where is the eustachian tube

Answer 8

middle ear

Question 9

what type of cartilage in external ear?

Answer 9

elastic

Question 10

what comes out of ceruminous glands?

Answer 10

ear wax

Question 11

what is the auricle?

Answer 11

the part of the ear wee see outside

Question 12

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

Answer 12

C2, C3 spinal nerves

Question 13

what nerve supples the rest of the outer auricle?

Answer 13

CN V3(mandibular)

Question 14

what 2 nerves supply ther external canal?

Answer 14

CN V3
CN X (vagus)

Question 15

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

Answer 15

vagus and also facial

Question 16

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

Answer 16

parotid

Question 17

cranial surface of superior half drain to what nodes?

Answer 17

mastoid (and deep cervical)

Question 18

rest of auricle and lobe drain to which nodes?

Answer 18

superficial cervical nodes

Question 19

all lymph from auricle eventually drains to?

Answer 19

deep cervial nodes, thoracic duct and venous angle

Question 20

what is an otoscopic examination?

Answer 20

looking at external acoustic meatus and tympanic membrane

children pull back and down
adults-pull back and up

Question 21

most depressed part of tympanic membrane?

Answer 21

umbo

Question 22

general sensory supply to external ear drum?

Answer 22

CN V3 (mostly)

Question 23

general sensory supply to external ear drunm?

Answer 23

CN IX glossophyarngeal

Question 24

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

Answer 24

CN IX glossopharyngeal

Question 25

connects middle ear to nasopharynx

Answer 25

eustachian tube

Question 26

name the 3 ossicles

Answer 26

malleus
incus
stapes (stirrup)

Question 27

what created the umbo?

Answer 27

handle of malleus

Question 28

describe course of facial nerve?

Answer 28

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

Question 29

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

Answer 29

chorda tympani branch of facial nerve

Question 30

thinnest skeletal muscle in body?

Answer 30

strapedius

Question 31

function of starpedius?

Answer 31

reduces stapes movement to pretect internal ear against excessive noise

Question 32

what does tensor tympani do?

Answer 32

dampens the sound of chewing

Question 33

muscle on forehead

Answer 33

frontalis

Question 34

muscled around eyes

Answer 34

orbicularis oculi

Question 35

2 parts of CN VIII

Answer 35

cochlear part-hearing

vestibular part-balance

Question 36

what does the otic capsule contain?

Answer 36

bony labyrinth which is fluid filled (perilymph)

Question 37

what is suspended in the perilymph of the bony labryrinth?

Answer 37

membranous labyrinth, communicating sacs and ducts and endolymph

Question 38

semiciruclar canals are part of the…?

Answer 38

vestibular apparatus

Question 39

snail looking thing

Answer 39

cochlea

Question 40

describe course of vestibulocochlear nerve/

Answer 40

connects at brain stem between pons and medulla

travels in internal acoustic meatus