Hearing & Vestibular Sense

Question 1

Outer ear consists of:

Answer 1

Pinna (auricle)
External auditory canal
Tympanic membrane

Question 2

Middle ear consists of:

Answer 2

The ossicles: malleus and staples

Question 3

Inner ear consists of:

Answer 3

Bony labyrinth

Question 4

Pinna function

Answer 4

Channels sound waves into the external auditory canal

Question 5

External auditory canal directs:

Answer 5

The sound waves to the tympanic membrane (eardrum)

Question 6

Louder sounds = _____ intensity

Answer 6

Greater

Question 7

What separates the outer ear from the middle ear

Answer 7

Tympanic membrane

Question 8

Ossicles

Answer 8

Found in the middle ear

Helps transmit and amplify the vibrations from the tympanic membrane to the inner ear

Question 9

Malleus (hammer)

Answer 9

Attached to the tympanic membrane

Acts on the incus (anvil) which acts on the staples (stirrup)

Question 10

Cochlea

Answer 10

Entrance to the inner ear

Staples rest on it

Question 11

Ossicles is made up of 3 parts. What are they ?

Answer 11

Staples
Malleus
Incus

Question 12

The middle ear is connected to the nasal cavity via what?

Answer 12

Eustachian tube

Question 13

Eustachian tube function?

Answer 13

Helps equalize pressure between the middle ear and the environment

Question 14

Bony labyrinth contains:

Answer 14

Cochlea
Vestibule
Semicircular canals

Question 15

(3) parts an ear is divided into

Answer 15

Inner, middle and outer ear

Question 16

What thin layer of fluid simultaneously transmits vibrations from the outside world and cushions the inner ear structures ?

Answer 16

Perilymph

Question 17

Cochlea

Answer 17

Detects sound

Spiral shaped organ divided into 3 parts called Scalae

Question 18

Organ of corti

Answer 18

Actual hearing apparatus

Contains thousands of hair cells bathed in endolymph

Question 19

Basilar membrane

Answer 19

Thin flexible membrane under the organ of corti

Question 20

Tectorial membrane

Answer 20

Immobile membrane on top of the organ of corti

Question 21

Sound enters the cochlea through the oval window and causes vibrations in the Perilymph which are transmitted to which membrane ?

Answer 21

Basilar membrane

Question 22

Round window

Answer 22

A membrane covered hole in the cochlea that permits the Perilymph to actually move within the cochlea

Question 23

Hair cells on the organ of corti function ?

Answer 23

Converts the physical stimulus into an electrical signal which is carried to the CNS by the auditory (vestibulocochlear) nerve

Question 24

Bony labyrinth is filled with

Answer 24

Perilymph

Question 25

Utricle and saccule

Answer 25

Is in the vestibule that is a portion of the bony labyrinth

Detect linear acceleration

Contain modified hair cells covered with otoliths (which resist motion as the body accelerates)

Question 26

Semicircular canals

Answer 26

Detect rotational acceleration

Question 27

Auditory pathway

Answer 27

Cochlea ➡️ vestibulocochlear nerve and medial geniculate nucleus (MGN) ➡️ auditory cortex in the temporal lobe

Question 28

Auditory group is found in what lobe?

Answer 28

Temporal

Question 29

Superior olive

Answer 29

Localizes the sound

Question 30

Inferior colliculus

Answer 30

Helps keep the eyes fixed on s point while the head is turned

Involved in the startle reflex

Question 31

Swaying of hair cells cause what to open?

Answer 31

Ion channels

Which cause receptors potentials