QUIZ 7 Flashcards

1
Q

otoconia

A

the calcium carbonate crystals that rest on the otolithic membrane overlying the hair cells of the sacculus and utricle

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

striola

A

a line found in both the saculus and utricle that divides the hair cells into two populations with opposing hair bundle polarities

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

ampullae

A

the swellings at the base of the semicircular canals that contain the hair cells and cupulae

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

kinocilium

A

the tallest structure in the hair bundle of vestibular hair cells

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

the vestibular system is able to detect
(multiple answers)

-translational acceleration in any direction
-orientation of the head with respect to gravity
-rotational acceleration in any direction

A

all of the above

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

after stereocilia move toward the kinocilium

-there is a decrease release of transmitter from the hair cell
-the hair cell hyperpolarizes
-there is decreased signaling in the vestibular nerve
-mechanically-gated channels close
-the hair cell depolarizes and there is increased signaling in the vestibular nerve

A

the hair cell depolarizes and there is increased signaling in the vestibular nerve

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

what type of movement do the saccule and utricle respond to, respectively?

-rotational; vertical
-vertical; rotational
-horizontal; rotational
-horizontal; vertical
-vertical; horizontal

A

vertical; horizontal

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

which statement about the firing rate in the vestibular afferents when an individual turns her head to the left is accurate?

-firing rate in the afferent from the right horizontal semicircular canal stays the same
-firing rate in the afferent from the left horizontal semicircular canal increases
-firing rate in the afferent from the left horizontal semicircular canal decreases
-firing rate in the afferent from the left horizontal semicircular canal stays the same
-firing rate in the afferent from the right horizontal semicircular canal increases

A

firing rate in the afferent from the left horizontal semicircular canal increases

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

why do we have three semicircular canals and not one or two?

-to monitor translation in the horizontal plane and vertical plane (the x, y, and z axes)
-to monitor yaw, pitch, and roll
-to create redundancy in case one of them malfunctions

A

to monitor yaw, pitch, and roll

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

which reflex allows a person to visually focus on an object as the head rotates?

-vestibulo-ocular reflex
-vestibulospinal reflex
-vestibular-cerebellar reflex
-vestibulocervical reflex
-vestibulomotor reflex

A

vestibulo-ocular reflex

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

due to the vestibulo-ocular reflex, which muscles contract when the head moves to the right?

-left lateral rectus and left medial rectus
-left lateral rectus and right lateral rectus
-left lateral rectus and right medial rectus
-right lateral rectus and left medial rectus
-right lateral rectus and right medial rectus

A

left lateral rectus and right medial rectus

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

stimulation to which area of the cortex elicits strong vestibular sensations?

-parietoinsular vestibular cortex (PIVC)
-Brodmann’s area 3a
-vestibular cortex
-Brodmann’s area 2v

A

parietoinsular vestibular cortex (PIVC)

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