Eye Movements

Question 1

What muscle is contracting when the eye is looking lateral?

Answer 1

Lateral Rectus

Medial Rectus is relaxed

Question 2

What muscle is contracting when the eye is looking medial?

Answer 2

Medial Rectus

Lateral Rectus is relaxed

Question 3

What muscles contract when the eye looks lateral and up?

Answer 3

Lateral Rectus and Superior Rectus

Medial Rectus and Superior Oblique are relaxed

Question 4

What muscles contract when the eye looks lateral and down?

Answer 4

Lateral Rectus and Inferior Rectus

Medial Rectus and Inferior Oblique are relaxed

Question 5

What muscles contract when the eye looks medial and up?

Answer 5

Medial Rectus and Inferior Oblique

Lateral Rectus and Inferior Rectus are Relaxed.

Question 6

What muscles contract when the eye looks medial and down?

Answer 6

Medial Rectus and Superior Oblique.

Lateral Rectus and Superior Rectus.

Question 7

Duction:

Answer 7

One eye movement

Question 8

Version:

Answer 8

Both eye movement

Question 9

Vergences:

Answer 9

Eyes move together toward something

Question 10

Convergence

Answer 10

Both eyes adducted

Question 11

Divergence

Answer 11

Both eyes abduct back to primary position

Question 12

What innervates the lateral rectus?

Answer 12

Abducens CN VI

Question 13

What innervates Superior Oblique?

Answer 13

Trochlear CN IV

Question 14

Cyclo

Answer 14

Corneas turning

Question 15

In-

Answer 15

medially

Question 16

Ex-

Answer 16

laterally

Question 17

Dex

Answer 17

Right

Question 18

Laver

Answer 18

Left

Question 19

Patient cannot turn right eye laterally - what is damaged?

Answer 19

Lateral Rectus or Abducens Nerve

Question 20

In terms of eye dilation, when do you know something is wrong?

Answer 20

When there is a 2 mm or more size difference between the two eyes.

Question 21

What is anisocoria?

Answer 21

Unequal size in eye pupils

Question 22

What happens with a 3rd nerve efferent lesion?

Answer 22

Contralateral constriction when dilated eye has light shown in it (one eye always dilated). So you know that each eye is working properly in the afferent limb but the efferent limb of the nerve is NOT working for the dilated eye.

Question 23

What causes ptosis of the eye, decreased sweating on that side of the face and failure to dilate of eye on that side of the face?

Answer 23

Horner’s Syndrome!

-No sympathetics from CN III

Question 24

In the darkness, when dilated eye stimulated with light, neither contract. What does this indicate?

Answer 24

There is a problem with the afferent optic nerve