Ear

Question 1

What structures does the external ear contain?

Answer 1

The auricle and the external acoustic meatus

Question 2

what does the auricle contain?

Answer 2

cartilage

Question 3

what does the auricle do?

Answer 3

captures waves and sounds

Question 4

Where does the external acoustic meatus span from and to

Answer 4

spans from the auricle to the tympanic membrane

Question 5

what is the lateral 2/3 of the external acoustic meatus made up of?

Answer 5

cartilage

Question 6

what is the medial 1/3 of the external acoustic meatus made up of?

Answer 6

temporal bone

Question 7

what is the purpose of the external acoustic meatus?

Answer 7

to direct sound waves into the ear

Question 8

what does the external acoustic meatus contain?

Answer 8

ceriminous glands, and debris traping hairs

Question 9

what is the purpose of the tympanic membrane

Answer 9

to vibrate in response to incoming sound waves AND to separate the external and middle ear

Question 10

where does the external acoustic meatus end?

Answer 10

at the tympanic membrane

Question 11

What is the purpose of the middle ear

Answer 11

collect and amplify sound waves and to transmit sound to internal ear

Question 12

what structures does the middle ear contain?

Answer 12

auditory ossicles, the tympanic membrane, the eustachian tube,

Question 13

where does eutahcian tube span from?

Answer 13

middle ear to the nasal sinus cavity

Question 14

what is the purpose of the eustachian tube?

Answer 14

to balance pressure in middle ear, to drain fluid from middle ear, to protect the ear from hearing any sounds the body causes and nasal drainage

Question 15

what bones are a part of the auditory ossicles?

Answer 15

malleus, incus, and stapes

Question 16

what is the purpose of the auditory ossicles

Answer 16

to connect the tympanic membrane and internal ear

Question 17

what are the muscles of the middle ear?

Answer 17

tensor tympani and the stapedius

Question 18

what do the muscles of the middle ear do?

Answer 18

prevent excessive vibration of the bony ossicles

Question 19

what presses against oval window?

Answer 19

the stapes pushes against oval window to transmit sound waves to internal ear

Question 20

what does the round window do?

Answer 20

help sounds waves travel through the internal ear

Question 21

internal ear

Answer 21

innermost compartment of the ear, encased in temporal bone, gives sensations of hearing and balance

Question 22

what is the internal ear composed of?

Answer 22

bony labyrinth and membranous labyrinth

Question 23

what does the bony labyrinth make p?

Answer 23

the cochlea, the vestibule, and 3 semicircular canals

Question 24

what is the purpose of the cochlea

Answer 24

the cochlea serves as a sensory organ for hearing that sends information to the brain

Question 25

vestibule is composed of

Answer 25

utricle and saccule

Question 26

the vesitbule detects

Answer 26

head position, gravity, and linear acceleration

Question 27

the vestibule functions to

Answer 27

maintain stability and posture

Question 28

the semicircular canals function to

Answer 28

detects rotational motion is 3 different planes and maintain balance

Question 29

where are sensory hair cells located?

Answer 29

the cochlea

Question 30

what to sensory hair cells detect

Answer 30

motion

Question 31

what do sensory hair cells do

Answer 31

hearing and balance

Question 32

what is in the bony labyrinth of the internal ear

Answer 32

perilympth

Question 33

what is in the membranous labyrinth of the bony ear

Answer 33

endolympth

Question 34

how does sound transmission work in the ear?

Answer 34

sounds waves are transmitted through the external ear to the tympanic membrane, vibrations pass through the ossicles of the middle ear, the stapes pushes against the oval window causing waves in perilympth of the cochlea. Next the waves of the perilympth push against the basilar membrane as they travel through the cochlea, Hair cells will then push against the tectorial membrane - when they bend a neural signal is transmitted. Lastly, impulses travel to the CNS via cochlear branch of CN 8

Question 35

the scala vestibuli is part of what structure

Answer 35

the cochlea

Question 36

the scala tympani is part of what stucture

Answer 36

the cochlea

Question 37

what is the cochlear duct called

Answer 37

the scala media

Question 38

what structure is the helicotrema a part of

Answer 38

the cochlea

Question 39

where is the organ of corti?

Answer 39

in the cochlea

Question 40

what in the middle ear is responsible for sound detection

Answer 40

hair cells

Question 41

in the vestubular apparatus - what does the vestibule do?

Answer 41

detects head position, gravity, and linear acceleration as well as maintains stability and posture

Question 42

in the vestibular apparatus what do semicircular canals do?

Answer 42

detects rotational movement and maintains balance

Question 43

what is dynamic equilibrium?

Answer 43

maintaing balance when head and body are moved suddenly

Question 44

what is static equilbrium

Answer 44

maintainuhng posture and stabiltiy when body is motionless

Question 45

what part of the ear is in charge of dynamic equilibrum

Answer 45

semicircular ducts

Question 46

what part of the ear is in charge of static equilibrium

Answer 46

saccule and utricle

Question 47

what is an ampulla?

Answer 47

swollen region containing sensory receptors

Question 48

what are cristae ampullaris

Answer 48

sensory hair cells clustered on ampulla

Question 49

what are the saccule and utricle of the vestibule?

Answer 49

membranous sacs filled with endolympth

Question 50

what detects horizontal acceleration?

Answer 50

utricle

Question 51

what detects vertical acceleration

Answer 51

saccule