Eye Movements Flashcards
What muscle is contracting when the eye is looking lateral?
Lateral Rectus
Medial Rectus is relaxed
What muscle is contracting when the eye is looking medial?
Medial Rectus
Lateral Rectus is relaxed
What muscles contract when the eye looks lateral and up?
Lateral Rectus and Superior Rectus
Medial Rectus and Superior Oblique are relaxed
What muscles contract when the eye looks lateral and down?
Lateral Rectus and Inferior Rectus
Medial Rectus and Inferior Oblique are relaxed
What muscles contract when the eye looks medial and up?
Medial Rectus and Inferior Oblique
Lateral Rectus and Inferior Rectus are Relaxed.
What muscles contract when the eye looks medial and down?
Medial Rectus and Superior Oblique.
Lateral Rectus and Superior Rectus.
Duction:
One eye movement
Version:
Both eye movement
Vergences:
Eyes move together toward something
Convergence
Both eyes adducted
Divergence
Both eyes abduct back to primary position
What innervates the lateral rectus?
Abducens CN VI
What innervates Superior Oblique?
Trochlear CN IV
Cyclo
Corneas turning
In-
medially
Ex-
laterally
Dex
Right
Laver
Left
Patient cannot turn right eye laterally - what is damaged?
Lateral Rectus or Abducens Nerve
In terms of eye dilation, when do you know something is wrong?
When there is a 2 mm or more size difference between the two eyes.
What is anisocoria?
Unequal size in eye pupils
What happens with a 3rd nerve efferent lesion?
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.
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?
Horner’s Syndrome!
-No sympathetics from CN III
In the darkness, when dilated eye stimulated with light, neither contract. What does this indicate?
There is a problem with the afferent optic nerve
