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Ocular Anatomy and Physiology : > Extraocular Muscles > Flashcards

Extraocular Muscles Flashcards

1
Q

What are the 6 Extraocular Muscles?

A 
Superior Rectus 
Inferior Rectus 
Medial Rectus 
Lateral Rectus 
Superior Oblique 
Inferior Oblique
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2
Q

What are the 3 Cranial Nerves that innervates the EOM’s?

A

CN III
CN IV
CN VI

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3
Q

What does CN III innervate?

A

Superior Recuts
Medial Rectus
Inferior Rectus
Inferior Oblique

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4
Q

What does CN IV innervate?

A

Superior Oblique

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5
Q

What does CN VI innervate?

A

Lateral Rectus

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6
Q

What is the Primary Action of Lateral Rectus?

A

Abduction

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7
Q

What is the primary action of Medial Rectus?

A

Adduction

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8
Q

What is the primary action of Superior Rectus?

A

Elevation

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9
Q

What is the primary action of Inferior Rectus?

A

Depression

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10
Q

What is the primary action of Superior Oblique?

A

Intorsion

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11
Q

What is the primary action of Inferior Oblique?

A

Extorsion

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12
Q

What is the term called when muscles from each eye work together to move the eyes together?

A

Yoke Muscles

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13
Q

What is the term called when a muscle in one eye is sent a signal to move, the Yoke muscle in the other eye receive equal innervation?
different

A

Hering’s Law of Equal Innervation

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14
Q

What is the term called when a signal of the muscle is sent to CONTRACT, the opposing muscles in that eye is to RELAX

A

Sherrington’s Law of Recriprocal Innervation

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15
Q

When the eye is ABDUCTED, what is the main ELEVATOR and the main DEPRESSOR?

A

Elevator : Superior Rectus

Depressor : Inferior Rectus

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16
Q

When the eyes are turned inwards (adducted) what eom has a DEPRESSION role and a ELEVATION role?

A

Depression : Superior Oblique

Elevation : Inferior Oblique

17
Q

When the eyes are straight / turned outward (abducted) what has the ELEVATION role and DEPRESSION role. What muscle is for INTORSION?

A

Elevation : Superior Rectus
Depression : Inferior Recuts
Intorsion : Superior Rectus

18
Q

What occurs when the visual axis of the eyes are NOT aligned? The eyes appear to look like they are in different directions.

A

Strabismus

19
Q

What is the amount of deviation measured in?

A

Prism Dioptres

20
Q

Direction of Deviation :

Eye turns down

A

Hypotropia

21
Q

Direction of Deviation :

Eye turns up

A

Hypertropia

22
Q

Direction of Deviation :

Eye turns out

A

Exotropia

23
Q

Direction of Deviation :

Eye turns in

A

Esotropia `

24
Q

What is the Tertiary Action for Superior/Inferior Rectus?

A

Adduct

25
Q

What is the Tertiary Action for Superior/Inferior Oblique?

A

Abduct

26
Q

What is the Secondary Action of Lateral Rectus?

A

None

27
Q

What is the Secondary Action of Medial Rectus?

A

None

28
Q

What is the Secondary Action of Superior Rectus?

A

Intorsion

29
Q

What is the Secondary Action of Inferior Rectus?

A

Extorsion

30
Q

What is the Secondary Action of Superior Oblique?

A

Depression

31
Q

What is the Secondary Action of Inferior Oblique?

A

Elevation

32
Q

What syndrome is the incorrect innervation of the EOM’s by CN’s?

  • born with it
  • patients have a limited ability to abduct or adduct or both.
  • muscles stretch when they should be tightened
A

Duane Syndrome

33
Q

What syndrome is when the tendons could be tight or short. Usually congenital

A

Brown Syndrome

34
Q

What are tests for the light reflexes?

A

Hirschberg and Krimsky

35
Q

What are the Stereovision tests?

A

Randot

Stereofly

36
Q

What test is to evaluate Strabismus?

A

Randot
Stereofly
Worth 4 dot

37
Q

When the eyes are ABDUCTED, what muscles have the role of elevation and depression?

A

Rectus

38
Q

When the eyes are ADDUCTED, what muscles have the role of depression and elevation?

A

Obliques

Ocular Anatomy and Physiology : (30 decks)

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