3.1 Vision and the Eye Part 3 Flashcards
What are the only fibers that cross at the optic chiasm?
medial fibers
Where does the left side of the brain receive information from regarding the eye?
medial side of the left eye
lateral side of the right eye
Where does the right side of the brain receive information from regarding the eye?
medial side of the right eye
lateral side of the left eye
How many muscles control eye movements?
six
What are the six extrinsic eye muscles?
medial recturs
inferior rectus
superior rectus
lateral rectus
superior oblique
inferior oblique
Which muscles does the oculomotor nerve innervate? (CN III)
medial rectus
inferior rectus
superior recturs
inferior oblique
Which muscle turns the eye medially?
medial rectus
What is the function of the inferior rectus?
moves the eye medially and depresses it
What is the function of the superior rectus?
moves the eye medially and elevates it
What is the function of the inferior oblique?
eye elevation
lateral movement
external rotation
What innervates the superior oblique muscle?
trochlear nerve
What is the function of the superior oblique muscle?
eye depression
lateral movement
internal rotation
What innervates the lateral rectus?
CN VI abducens
What is the function of the lateral rectus?
lateral movement of the eye
What are cataracts?
lenses that slowly become hardened and cloudy over time
Why do cataracts make vision look blurry?
light is unable to enter the lens and be refracted to the retina
What internal damage to the brain can cause vision impairment?
CVA
brain tumor
What does damage to the abducens nerve cause?
diplopia
What is diplopia?
double vision
What occurs during a test for diplopia/damage to abducens nerve?
affected eye deviates medially when looking forward because of the imbalance in muscle tone between medial and lateral recti
