Auditory System Flashcards

1
Q

three regions of the ear

A
  • external ear
  • middle ear
  • inner ear
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

components of the external ear

A
  • auricle
  • external auditory meatus
  • tympanic membrane
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

auricle

A
  • S-shaped tube
  • outer 2/3 is made of elastic cartilage
  • inner 1/3 is made of bone
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

external auditory meatus location

A

-opening in temporal bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

external auditory meatus components

A
  • hairs and glands

- cerumen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

hairs and glands location/function

A
  • on outer portion of sebaceous glands

- produces oil to lubricate hair and collect dust

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

cerumen

A
  • aka ear wax
  • waxy substance secreted by glands in outer ear
  • repels insects
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

tympanic membrane**

A
  • aka eardrum
  • separates the outer ear from middle ear
  • very thin membrane
  • vibrates when hit by sound waves
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

middle ear components

A
  • tympanic cavity
  • auditory (eustachian tube)
  • ossicles (small bones)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

tympanic cavity

A

-lined with mucous cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

eustachian tube**

A

-connects nasopharynx with middle ear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

ossicles components

A
  • malleus
  • incus
  • stapes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

malleus

A

-attached to tympanic membrane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

incus

A

-interposed between malleus and stapes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

stapes

A

-inserted into oval window of inner ear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

inner ear function

A

-has receptors for hearing and equilibrium

17
Q

which cranial nerve transmits the receptor impulses to the brain for interpretation?

A

-vestibulocochlear nerve

18
Q

what is the inner ear also called?

19
Q

inner ear inner membranous cavity and tube fluid components

A
  • perilymph

- endolymph

20
Q

perilymph

A

-surrounding water

21
Q

endolymph

A

-inner water

22
Q

inner ear components

A
  • cochlea
  • vestibule
  • semicircular canals
23
Q

cochlea structure

A
  • spiraling chamber in body labyrinth (“snail”)

- used for hearing

24
Q

cochlea components

A

-organ of corti

25
organ of corti
- located in inner ear | - "hair cell" receptors for hearing
26
auditory pathway
-cochlear division of CN VIII--> nucleus of CN VIII in medulla--> thalamus--> auditory cortex of temporal lobe (area 41,42)
27
vestibular apparatus components
- semicircular canals | - utricle and saccule
28
semicircular canals
- three horse shoe shaped structures arranged at different angles filled w fluid - motion of head moves hair cells, creating electrical impulse conducted to brain - important for dynamic equilibrium(i.e. spinning)
29
utricle and saccule
- bulging chambers in vestibule containing fluid and hair cells w suspended crystals (aka otolins) - motion causes crystals to move the hair cells, creating electrical impulse - important for static equilibrium(activated in acceleration; i.e. car, elevator)
30
vestibular pathway
-vestibular division of CN VIII--> vestibular nuclei of pons and medulla--> cerebral cortex