Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BMSC Regional Gross Anatomy 2 > inner ear > Flashcards

inner ear Flashcards

1
Q

how are waves of movement created in the fluid of the inner ear

A

vibration from the stapes at the oval window

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

what cells are housed in the membranes of the inner ear

A

special hearing and balance

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

what are the 2 labyrinths in the inner ear

A

bony and membranous

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

the bony labyrinths are surrounded by what

A

otic capsule

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

where is the otic capsule located

A

petrous temporal bone

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

describe the bony labyrinth

A

system of canals filled with perilymph

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

what is perilymph similar to

A

extra-cellular fluid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

the bony labyrinth contains what

A

cochlea
vestibule
semi-circular canals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the membranous labyrinth

A

continuous system of ducts and sacs inside the bony labyrinth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

the membranous labyrinth is suspended in what and contains what

A

suspended in perilymph and contains endolymph

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

what is endolymph similar to

A

K+ rich intra-cellular fluid

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

what is the function of perilymph and endolymph

A

conduct sound vibrations and respond to mechanical forces (movement and acceleration)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

the cochlea houses what cells

A

special cells of hearing

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

vibration is passed from the footplate of the stapes to what

A

membrane of oval window

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

when the oval window vibrates, a wave of movement passes where

A

perilymph of the scala vestibuli

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

where does the scala vestibuli ascend to

A

top of the shell shape of the cochlea

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what is the name of the scala vestibuli at the top of the cochlea

A

helicotrema

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

describe the path of vibrations from the oval window

A

movement in perilymph of scala vestibuli, passes in scala vestibuli to top of cochlea (helicotrema) then down other side in scala tympani to base of cochlea at the round window

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what happens to vibrations at the round window

A

nothing attached so they dissipate into middle ear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what happens as the wave of vibration passes through the perilymph

A

presses on membranous labyrinth (cochlear duct) which deforms the membrane which is detected by the special cells within the membrane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

what is the name of the membrane of the cochlear duct

A

tectorial membrane

22
Q

the cochlear duct lies between the scala vestibuli and

A

the scala tympani

23
Q

what cells in what in the cochlea detect movement and transform it into electrical energy (nerve impulse)

A

cells in the spiral organ (organ of corti)

24
Q

the nerve impulse from the organ of corti is passed where

A

cochlear nerve - part of CN VIII

25
Q

the CN VIII carries impulse to where

A

auditory cortex of brain

26
Q

why are the scala called so

A

stairs - you ascend the vestibular cells to the top of the cochlea and then descend via the tympanic staircase

27
Q

where do the semicircular canals lie in relation to the vestibule

A

posterior and lateral to the vestibule

28
Q

what are the 3 semi-circular canals

A

anterior posterior and lateral

29
Q

describe the shape of the semi-circular canals

A

each canal is 2/3 of a circle and 1.5mm in diameter

30
Q

what are the orientations of the semi-circular canals

A

anterior and posterior are at right angles

lateral is horizontal

31
Q

which semi-circular canal is horizontal

A

lateral

32
Q

what do the semi-circular canals contain

A

semi circular ducts of the membranous labyrinth

33
Q

the semi-circular ducts are continuous with what

A

semi-circular ducts

34
Q

each semi circular duct swells at the end forming a

A

ampullae

35
Q

what is the vestibule

A

area of bony labyrinth that the oval window opens into, which communicates with the cochlea and semicircular canals

36
Q

where do the semi-circular ducts house motion sensitive cells

A

ampullae

37
Q

each ampulla houses what

A

equilibrium receptor called crista ampullaris

38
Q

what does crista ampullaris respond to

A

angular (rotational) movements of the head

39
Q

how long is the vestibule

A

5mm

40
Q

what is found inside the vestibule

A

2 membranous sacs; utricle and saccule

41
Q

what do the utricle and saccule contain

A

equilibrium receptors called maculae

42
Q

what do maculae respond to

A

pull of gravity and changes in head position

43
Q

motion is detected by waves of movement through the endolymph inside what

A

ampullae
utricle
sacule

44
Q

nerve impulses from the receptors in the ampullae, utricle and saccule to what

A

into the vestibular part of CN XIII

45
Q

what are otoliths

A

minute pieces of bone that sit on the receptor cells and move in response to the movement of the endolymph

46
Q

the vestibulocochlear nerve passes from what part of the brainstem

A

pons

47
Q

is the cochlear or vestibular nerve more superior

A

cochlear nerve superior

48
Q

what brain foramen does the vestibulocochlear nerve pass through

A

internal acoustic meatus

49
Q

the main supply to the inner ear is from what

A

internal auditory (labyrinthine)

50
Q

what branches does the internal auditory artery give

A

common cochlear and vestibular arteries

51
Q

the internal auditory artery is a branch of what in 80% of people or what

A

branch of anteroinferior cerebellar artery in 80% of people

or basilar artery

BMSC Regional Gross Anatomy 2 (36 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions