Ear

Question 1

Does chorda tympani run through the middle ear cavity?

Does facial?

Answer 1

yes

no

Question 2

adjacent infection can spread from middle ear to

Answer 2

facial nerve

Question 3

external ear components

Answer 3

pinna, external auditory meatus

Question 4

innervation of the pinna

Answer 4

GSA sensory from auriculotemporal (v3)

lesser occipital and great auricular

Question 5

auricular hematoma

Answer 5

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

Question 6

blood supply to pinna

Answer 6

postirior auricular artery

superficial temporal a

Question 7

sensory nerve to pinna

Answer 7

arnold’s nerve

Question 8

casual removal of a mass of ear wax may

Answer 8

avulse the tympanic membrane and the ossicles

Question 9

when infected, the furuncle is very painful due to

Answer 9

close adherence of skin to the underlying periosteum

Question 10

tympanic membrane is tilted

Answer 10

forward, lateral and downward in the canal

so you can hear steps coming towards you

Question 11

part of the eardrum that vibrates

Answer 11

pars tensa

Question 12

three layers of tympanic membrane

Answer 12

outer epidermis
middle fibrous
inner mucous membrane

Question 13

pars tensa is

Answer 13

fibrous layer in the middle between the epidermis and mucous membrane

Question 14

outer epidermis of eardrum enervated by

Answer 14

GSA fibers from trigeminal and vagus

Question 15

pars flaccida

Answer 15

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

Question 16

inner mucous membrane is innervated by

Answer 16

GVA fibers of glossopharyngeal nerve via the tympanic plexus

Question 17

umbo

Answer 17

central concavity of tympanic membrane

Question 18

anterior and posterior mallear folds formed by

what passes through these folds

Answer 18

inner mucous membrane on borders of pars flaccid

chorda tympani nerve

Question 19

Facial nerve in the middle ear

Answer 19

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

Question 20

ossicles are formed in what branchial arch

Answer 20

2nd

Question 21

tensor tympani m formed from what branchial arch

Answer 21

1st arch. in relationship with the malleus and incus

Question 22

auditory tube can be opened by

Answer 22

swallowing

Question 23

cochlea is _____ to facial nerve

Answer 23

anterior

Question 24

facial nerve passes between the

Answer 24

chochlea and the semicircular canals in the facial canal.

Question 25

course of the facial nerve

Answer 25

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

Question 26

muscles of middle ear cavity

Answer 26

tensor tympani | stapedius

Question 27

Tensor tympani innervation and function

Answer 27

V3 | tightens the tympanic membrane and attenuates its vibrations

Question 28

stapedius m innervation and function

Answer 28

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

Question 29

Cochlear division of 8 innervates____ | conveys what type of information?

Answer 29

the organ of corti (spiral organ) | auditory

Question 30

vestibular division of 8 innervates____ | conveys what information?

Answer 30

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

Question 31

inner ear blood supply

Answer 31

labryinthine artery

Question 32

arteriosclerosis of labyrinthine artery

Answer 32

may result in vertigo nausea and other inner ear abnormaliteis

Question 33

membraneous labyrinth is suspended in

Answer 33

bony structure or canal - bony labyrinth

Question 34

endolymph is found in ______ | perilymph is found in ______

Answer 34

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

Question 35

semicircular canals are found in

Answer 35

bony labyrinth

Question 36

vestibule of bony labyrinth houses

Answer 36

utricle and saccule

Question 37

elliptical cavity in vestibule houses

Answer 37

utricle

Question 38

spherical cavity in vestibule houses

Answer 38

saccule

Question 39

what taps on oval window to set up waves in fluid

Answer 39

stapes

Question 40

electrolytes are different in endolymph so they can set up

Answer 40

depolarization

Question 41

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

Answer 41

the membranous labyrinth

Question 42

semicircular ducts ar part of what labyrinth? suspended in?

Answer 42

membranous. suspended in semicircular canals of bony labyrinth

Question 43

crista ampulalaris detects

Answer 43

angular acceleration

Question 44

utricle and saccule are located in

Answer 44

vestibule of osseous labyrinth

Question 45

utricle and saccule are connected to each other

Answer 45

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

Question 46

macula utricle detects

Answer 46

linear acclerateion

Question 47

macula saccule detects

Answer 47

low frequency vibrations

Question 48

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

Answer 48

cochlea

Question 49

inside the cochlea is the

Answer 49

cochlear duct

Question 50

inside the cochlear duct is the

Answer 50

organ of corti

Question 51

bony core of chochlea=

Answer 51

modiolus

Question 52

what passes through the modiolus

Answer 52

choclear nerve

Question 53

projects from the modiolus like the threads of a screw

Answer 53

spiral lamina

Question 54

organ of corti inside

Answer 54

the cochlear duct

Question 55

organ of corti contains

Answer 55

receptors for hearing

Question 56

hair cells are arranged

Answer 56

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

Question 57

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

Answer 57

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