Ear Anatomy

Question 1

is the lateral 1/3 of the external acoustic meatus cartilage or bone?

Answer 1

cartilage

Question 2

is the medial 2/3 of the external acoustic meatus cartilage or bone?

Answer 2

bone that connects with tympanic membrane

Question 3

what is the roof of the middle ear formed by?

Answer 3

tegmen tympani

Question 4

what CN traverses in the middle ear?

Answer 4

facial nerve

Question 5

name the three bones of the middle ear

Answer 5

malleus incus and stapes

Question 6

what bone is against the tympanic membrane?

Answer 6

malleus

Question 7

what bone covers the oval window?

Answer 7

stapes

Question 8

what does the oval window lead to?

Answer 8

the inner ear

Question 9

what is just inferior to the round window?

Answer 9

oval window

Question 10

what are the two muscles of middle ear?

Answer 10

tensor tympani

stapedius

Question 11

what is the role of the muscles of the middle ear?

Answer 11

they protect the ear from loud sounds

Question 12

what nerve innervated the tensor tympani?

Answer 12

V3

Question 13

what nerve innervates the stapedius?

Answer 13

facial nerve

Question 14

what is role of tensor tympani?

Answer 14

tenses the eardrum

Question 15

what is role of the stapedius?

Answer 15

dampens vibrations going into the oval window

Question 16

what is the central depression in the tympanic membrane called?

Answer 16

umbo

Question 17

what bone can you see on tympanic mem?

Answer 17

handle of the malleus

Question 18

what bone does the tensor tympani insert on?

Answer 18

malleus

Question 19

what is the bulge of the middle ear called?

Answer 19

promontory

Question 20

where in the middle ear is the promontory?

Answer 20

medial most aspect

Question 21

what are the components of the vestibular apparatus in the inner ear?

Answer 21

semicircular canals and utricle and saccule

Question 22

what are the utricle and saccule responsible for in the inner ear?

Answer 22

vestibular sensation of linear accelerations

Question 23

what is the semicircular canal in charge of in vestibular system?

Answer 23

angular acceleration changes

Question 24

what is the inner ear area called?

Answer 24

bony labyrinth

Question 25

what is the bony labyrinth filled with?

Answer 25

perilymph

Question 26

what is suspened within the bony labyrinth?

Answer 26

membranous labyrinth

Question 27

what is the membranous labyrinth filled with?

Answer 27

endolymph

Question 28

what four things are in the membranous labyrinth?

Answer 28

cochlear duct utricle and saccule semicircular ducts

Question 29

what are the specialized sensory epithelium of the utricle and saccule called?

Answer 29

maculae

Question 30

what is the ampulla?

Answer 30

small swelling at base of semicircular ducts

Question 31

what does the ampulla have in it?

Answer 31

crista

Question 32

what are crista?

Answer 32

specialized sensory cells of the semicircular duct that responds to rotational movement

Question 33

how many turns does the cochlea make?

Answer 33

2.5

Question 34

what are the three chambers of the cochlea

Answer 34

scala vestibula scala tympani scala media (cochlear duct)

Question 35

what chambers of the cochlea contain perilymph?

Answer 35

scala vestibuli and scala tympani

Question 36

what chamber of the cochlea contains perilymph?

Answer 36

scala media (cochlear duct)

Question 37

what are the two membranes that separate chambers in the cochlea?

Answer 37

vestibular and basilar membranes

Question 38

where is the specialized epithelial cells in the cochlea?

Answer 38

organ of corti

Question 39

what is the membrane of the organ of corti?

Answer 39

tectorial membrane

Question 40

vibrations from the oval window enter into what chamber of the cochlea?

Answer 40

scala tympani

Question 41

the vibrations travel in the scala tympani until where?

Answer 41

the helicotrema

Question 42

what happens to vibrations at the helicotrema?

Answer 42

they get transmitted into the scala vesitbuli

Question 43

what does the pressure wave moving through the scala tympani/vestibuli cause in the organ of corti?

Answer 43

pressure wave there too that stimulates nerve ending on end of organ of corti

Question 44

what nerve provides sensory innervation to the tympanic cavity?

Answer 44

glossopharyngeal

Question 45

what nerve plexus can be seen in the tympanic cavity? what is it called?

Answer 45

tympanic plexus of the glossopharyngeal nerve

Question 46

what is sensation nerve for area around entrance to and the external acoustic meatus?

Answer 46

vagus nerve

Question 47

what is sensation on anterior portion of outer ear?

Answer 47

trigeminal nerve V3

Question 48

what is sensation on posterior portion of outer ear?

Answer 48

facial nerve