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Vestib > Chapter 1: Neural Control Of Eye Movements > Flashcards

Chapter 1: Neural Control Of Eye Movements Flashcards

0
Q

What is the primary action of the medial rectus?

A

Moves eyes inward.

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1
Q

What are the 6 extraocular muscles?

A 
Medial rectus
Lateral rectus
Superior rectus
Inferior rectus
Superior oblique 
Inferior oblique
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2
Q

What is the primary action of the lateral rectus?

A

Moves eyes outward.

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3
Q

What is the primary action of the superior rectus?

A

Moves eyes upward.

Secondary: rotates top of eye toward nose.

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4
Q

What is the primary action of the inferior rectus?

A

Moves eye downward.

Secondary: rotates top of eye away from nose.

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5
Q

What is the primary action of the superior oblique?

A

Rotates top of eye toward nose.

Secondary: moves eye downward.

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6
Q

What is the primary action of the inferior oblique?

A

Rotates top of the eye away from nose.

Secondary: moves eye upward.

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7
Q

What is the cranial nerve innervation of the medial rectus EOM?

A

Cn III - oculomotor

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8
Q

What is the cranial nerve innervation of the lateral rectus EOM?

A

CN VI - abducens

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9
Q

What is the cranial nerve innervation of the superior rectus EOM?

A

CN III - oculomotor

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10
Q

What is the cranial nerve innervation of the inferior rectus EOM?

A

CN III - oculomotor

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11
Q

What is the cranial nerve innervation of the superior oblique EOM?

A

CN IV - trochlear

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12
Q

What is the cranial nerve innervation of the inferior oblique EOM?

A

CN III - oculomotor

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13
Q

What are the primary premotor structures?

A 
Medial longitudinal fasiculus 
Superior colliculus 
Superior and lateral vestibular nuclei
Lateral vestibular nucleus 
Pontine excitatory burst neurons 
Medial vestibular nucleus 
Repositus hypoglossal (PPH)
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14
Q

What is the function of the medial longitudinal fasiculus?

A

Central conduit to the motor nuclei for coordinated and synchronized eye movements

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15
Q

What is the function of the superior colliculus?

A

Generates quick eye movements for orienting to visual or auditory stimuli

16
Q

What is the function of the superior and lateral vestibular nuclei?

A

Plays a major role in the generation of the VOR and optokinetic nystagmus.

17
Q

What is the function of the lateral vestibular nucleus?

A

Fixes images with head stable and environment moving

18
Q

What is the function of the pontine excitatory burst neurons?

A

Generates s ballistic eye movements for acquisition of visual target

19
Q

What is the function of the medial vestibular nucleus

A

Stabilizes images during head movement and stabilizes environment

20
Q

What is the function of the repositus hypoglossal (PPH)

A

Holds a forever on the fovea

21
Q

What eye movements are associated with the medial longitudinal fasiculus?

A

Involved in all classes of eye movements

22
Q

What eye movements are associated with the superior colliculus?

A

Saccades

23
Q

What eye movements are associated with the superior and lateral vestibular nuclei?

A

VOR and optokinetic

24
Q

What eye movements are associated with the lateral vestibular nucleus

A

Optokinetic

25
Q

What eye movements are associated with the pontine excitatory burst neurons

A

Saccade

26
Q

What eye movements are associated with the medial vestibular nucleus?

A

VOR

27
Q

What eye movements are associated with the repositus hypoglossal (PPH)?

A

Together with the MVN (medial vestibular nuclei) it participates in horizontal gaze-holding.

28
Q

What three factors affect our ability to see in detail?

A
  1. Where the target is located
  2. Whether the target is moving or stationary
  3. Whether the observer is moving or stationary
29
Q

What two types of receptor cells are found in retina?

A

Rods

Cones

30
Q

Where are cones located?

A

In and around the fovea, making it the part of the eye with highest spatial sensitivity and the part responsible for visual acuity

31
Q

What three components can the OMS be organized into?

A

Motor system
Premotor system
Type of eye movement system

Vestib (2 decks)

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