3.1 Vision and the Eye Part 3

Question 1

What are the only fibers that cross at the optic chiasm?

Answer 1

medial fibers

Question 2

Where does the left side of the brain receive information from regarding the eye?

Answer 2

medial side of the left eye
lateral side of the right eye

Question 3

Where does the right side of the brain receive information from regarding the eye?

Answer 3

medial side of the right eye
lateral side of the left eye

Question 4

How many muscles control eye movements?

Answer 4

six

Question 5

What are the six extrinsic eye muscles?

Answer 5

medial recturs
inferior rectus
superior rectus
lateral rectus
superior oblique
inferior oblique

Question 6

Which muscles does the oculomotor nerve innervate? (CN III)

Answer 6

medial rectus
inferior rectus
superior recturs
inferior oblique

Question 7

Which muscle turns the eye medially?

Answer 7

medial rectus

Question 8

What is the function of the inferior rectus?

Answer 8

moves the eye medially and depresses it

Question 9

What is the function of the superior rectus?

Answer 9

moves the eye medially and elevates it

Question 10

What is the function of the inferior oblique?

Answer 10

eye elevation
lateral movement
external rotation

Question 11

What innervates the superior oblique muscle?

Answer 11

trochlear nerve

Question 12

What is the function of the superior oblique muscle?

Answer 12

eye depression
lateral movement
internal rotation

Question 13

What innervates the lateral rectus?

Answer 13

CN VI abducens

Question 14

What is the function of the lateral rectus?

Answer 14

lateral movement of the eye

Question 15

What are cataracts?

Answer 15

lenses that slowly become hardened and cloudy over time

Question 16

Why do cataracts make vision look blurry?

Answer 16

light is unable to enter the lens and be refracted to the retina

Question 17

What internal damage to the brain can cause vision impairment?

Answer 17

CVA
brain tumor

Question 18

What does damage to the abducens nerve cause?

Answer 18

diplopia

Question 19

What is diplopia?

Answer 19

double vision

Question 20

What occurs during a test for diplopia/damage to abducens nerve?

Answer 20

affected eye deviates medially when looking forward because of the imbalance in muscle tone between medial and lateral recti