Lecture 18 - Eye Movement

Question 1

What are the 6 extra-ocular muscles?

Answer 1

1. superior rectus
2. superior oblique
3. inferior oblique
4. inferior rectus
5. lateral rectus
6. medial rectus

Question 2

Which muscles are responsible for horizontal movement?

Answer 2

1. lateral rectus (abduction away from nose)

2. medial rectus (adduction towards nose)

Question 3

Which muscles are responsible for vertical movement?

Answer 3

1. superior rectus (elevation)

2. inferior rectus (depression)

Question 4

Which muscles are responsible for torsional movements?

Answer 4

1. superior oblique (intorsion)

2. inferior oblique (extorsion)

Question 5

_____ _______ is responsible for innervating 4 of the muscles

Answer 5

oculomotor nucleus (Cranial nerve III)

Question 6

All are ipsilateral except

Answer 6

superior oblique

Question 7

Which muscle does IV innervate?

Answer 7

superior oblique

Question 8

What muscles does VI innervate?

Answer 8

lateral rectus

Question 9

Which muscles does III innervate

Answer 9

• medial rectus
• superior rectus
• inferior oblique
• inferior rectus

Question 10

What are the 3 types of eye movements?

Answer 10

1. direct gaze to targets of interest, track those targets as they move
2. help align fovea of each eye on target (eyes move in different directions)
3. compensate for head movements, keep target of interest centered on fovea