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Med Neur 2 > Vestibular system podcasts > Flashcards

Vestibular system podcasts Flashcards

1
Q

How many vestibular nuclie are ther

A

4

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2
Q

Where are the vestibular nuclie located

A

2 in caudal pons

2 in Rostral medulla

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3
Q

What 2 vestibular nuclie lie in the Caudal pons

A

Superior vestibular nucleus

Lateral vestibular nucleus

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4
Q

What 2 vestibular nuclei lie in the rostral medulla

A

Medial vestibular nucleus and Inferior vestibular nucleus

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5
Q

Where are sensory nuclei located on the brainstem?

A

on the side of the brainstem

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6
Q

Lateral Vestibulospinal Tract

• Function:

A

Maintains balance and posture

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7
Q

Route of Lateral Vestibulospinal Tract

A

• Route: Pathway descends ipsilaterally from lateral vestibular nucleus to all spinal cord levels

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8
Q

Mechanism of Lateral vestibulospinal tract

A

• Mechanism: Excites extensor muscles of the neck, back and lower limbs (antigravity muscles)

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9
Q

Medial Vestibulospinal Tract

• Functions:

A

Adjusts head position in response to postural changes

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10
Q

Pathway of Medial Vestibulospinal Tract

A

• Pathway descends bilaterally from medial vestibular nucleus to cervical spinal cord levels Coordinates eye movements with each other

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11
Q

What does the medial vestibulospinal tract do

A

• Pathway projects superiorly and bilaterally along medial longitudinal fasciculus (MLF) from vestibular nuclei to the paramedian pontine reticular formation (PPRF).
a. The PPRF projects to the ipsilateral abducens nucleus which, in turn, projects to the contralateral oculomotor nucleus
• The eyes are yoked together resulting in conjugate horizontal gaze.
a. Coordinates eye movements to compensate for head movements (i.e. the vestibuloocular reflex - VOR)
• The VOR maintains eye position during head turning.

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12
Q

The vestibuloocular reflex (VOR)

A

coordinates eye movemtns to compensate for eye movements

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13
Q

The VOR is done through

A

the Medial Vestibulospinal Tract

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14
Q

Tract responsible for coordinating eye movements with each other

A

Medial vestibulospinal tract

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15
Q

keeps eyes yolked together

A

Medial vestbulonspinal tract

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16
Q

What two places to the Median Vestibular nucleaus send axons to?

A

To cervicle spinal cord to have contol over the SCM via CN XI and up to the Medial Longitudinal Fasiculus because there are cranial verve nuclie that control ocular eye movment

17
Q

Where do Lateral vestibular nuclie get info from?

A

From the Flocculous on cerebellum and from CNVIII about body position

18
Q

Where do Lateral Vestibulospinal tracts go?

A

descend ipsilaterally to all sp cd levels to innerate antigravity muscles and inhibit flexor muscles

19
Q

Pathway from medial vestibulospinal tracts projects superiorly and bilaterally along medial longitudinal fasciculus (MLF) from vestibular nuclei to the

A

paramedian pontine reticular formation (PPRF).

20
Q

Each abducens nucleus is in communication via _____ with the contralateral oculomotor nucleus

A

Medial longitutinal fasiculus

21
Q

The eyes end up being yoked together resulting in

A

conjugate horizontal gaze

22
Q

What keeps your eyes focused on ojbect as you move your head?

A

vestibulococular reflex

you can maintain foveation as you move your head

23
Q

The ______ projects to the ipsilateral abducens nucleus which, in turn, projects to the contralateral oculomotor nucleus

A

PPRF

24
Q

Semicircular canals detect head mvmt toward the left and send signals to

A

vestibular nuclei

25
Q

Vestibular nuclei project to brainstem nuclei that control

A

extraocular eye muscles

26
Q

Rhythmic oscillations of the eyeballs

A

Nystagmus

27
Q

Rotation of the head causes

A

(rotary nystagmus)

28
Q

Observing a moving object when the head is stationary causes

A

(optokinetic nystagmus)

29
Q

Temperature-generated convection currents in semicircular canal endolymph causes

A

(caloric nystagmus)

30
Q

Warm water in left ear will give us _____ beating nystagmus

A

left

31
Q

Cold water in left ear results in ______ beating nystagmus

A

right

32
Q

Involuntary movemnt of a patients eye to an equal extent but in opposite direction of a head turn indicates

A

normal VOR thus central vestibular pathways are working properly and the brainstem is functioning

Med Neur 2 (12 decks)

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