Extraocular Muscles

Question 1

What are the 6 Extraocular Muscles?

Answer 1

Superior Rectus 
Inferior Rectus 
Medial Rectus 
Lateral Rectus 
Superior Oblique 
Inferior Oblique

Question 2

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

Answer 2

CN III
CN IV
CN VI

Question 3

What does CN III innervate?

Answer 3

Superior Recuts
Medial Rectus
Inferior Rectus
Inferior Oblique

Question 4

What does CN IV innervate?

Answer 4

Superior Oblique

Question 5

What does CN VI innervate?

Answer 5

Lateral Rectus

Question 6

What is the Primary Action of Lateral Rectus?

Answer 6

Abduction

Question 7

What is the primary action of Medial Rectus?

Answer 7

Adduction

Question 8

What is the primary action of Superior Rectus?

Answer 8

Elevation

Question 9

What is the primary action of Inferior Rectus?

Answer 9

Depression

Question 10

What is the primary action of Superior Oblique?

Answer 10

Intorsion

Question 11

What is the primary action of Inferior Oblique?

Answer 11

Extorsion

Question 12

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

Answer 12

Yoke Muscles

Question 13

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

Answer 13

Hering’s Law of Equal Innervation

Question 14

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

Answer 14

Sherrington’s Law of Recriprocal Innervation

Question 15

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

Answer 15

Elevator : Superior Rectus

Depressor : Inferior Rectus

Question 16

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

Answer 16

Depression : Superior Oblique

Elevation : Inferior Oblique

Question 17

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

Answer 17

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

Question 18

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

Answer 18

Strabismus

Question 19

What is the amount of deviation measured in?

Answer 19

Prism Dioptres

Question 20

Direction of Deviation :

Eye turns down

Answer 20

Hypotropia

Question 21

Direction of Deviation :

Eye turns up

Answer 21

Hypertropia

Question 22

Direction of Deviation :

Eye turns out

Answer 22

Exotropia

Question 23

Direction of Deviation :

Eye turns in

Answer 23

Esotropia `

Question 24

What is the Tertiary Action for Superior/Inferior Rectus?

Answer 24

Adduct

Question 25

What is the Tertiary Action for Superior/Inferior Oblique?

Answer 25

Abduct

Question 26

What is the Secondary Action of Lateral Rectus?

Answer 26

None

Question 27

What is the Secondary Action of Medial Rectus?

Answer 27

None

Question 28

What is the Secondary Action of Superior Rectus?

Answer 28

Intorsion

Question 29

What is the Secondary Action of Inferior Rectus?

Answer 29

Extorsion

Question 30

What is the Secondary Action of Superior Oblique?

Answer 30

Depression

Question 31

What is the Secondary Action of Inferior Oblique?

Answer 31

Elevation

Question 32

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

Answer 32

Duane Syndrome

Question 33

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

Answer 33

Brown Syndrome

Question 34

What are tests for the light reflexes?

Answer 34

Hirschberg and Krimsky

Question 35

What are the Stereovision tests?

Answer 35

Randot | Stereofly

Question 36

What test is to evaluate Strabismus?

Answer 36

Randot Stereofly Worth 4 dot

Question 37

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

Answer 37

Rectus

Question 38

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

Answer 38

Obliques