Eye Flashcards
how may extra ocular muscle
6
3 pupil movements
movement of pupil after muscle action
movement of pupil during testing muscle action
position of pupil after nerve paralysis
name 6 extra ocular muscle
superior rectus
superior oblique
median rectus
inferior oblique
inferior rectus
lateral rectus
2 axis and walls of orbital cavity orientation
medial vs lateral walls
axis of orbit vs axis of eyeball
basic shape of orbit
pyramid
3 axis of movement of the eye
horizontal
vertical
torsion
3 movements of the eye
elevation/depression
abduction / adduction
intorsion / extorsion
intorsion
the top of the eye moving towards the nose
extorsion
the superior aspect of the eye moving away from the nose
vertical axis
left and right
horizontal axis
up and down
torsion axis
towards and away from the nose
intorsion and extortion
intorsion = medial rotation, incyclotorsion
extorsion = lateral rotation. excyclotorsion
abduction and adduction of the eye
abduction = away from the nose
adduction = towards the nose
elevation and depression
elevation = up
depression = down
what direction would pupil face if lateral rectus contracts
Abduction
what direction would the pupil face if the superior rectus contracts
Elevation, incyclotorsion, adduction
what direction would the pupil face if the inferior oblique contracts
excyclotorsion, elevation, abduction
what direction would the pupil face if the superior oblique contracts
incyclotorsion, depression, abduction
where is the inferior oblique muscle positioned
starts on the floor of the cavity and then wraps around the eyeball
where is the superior oblique positioned
starts on the back and runs along the medial wall
what happens to the pupil when the medial rectur contracts
adduction
what happens to the pupil when the inferior rector contracts
depression
excyclotorsion
adduction
procedure of a squint or strabismus surgical correction
detach section of eye muscle is removed
muscle is moved back or brought forward
movement of pupil during testing the muscle action
testing for the presence of extra ocular muscle is different from their actions
test for superior rectus
look laterally and up
test for inferior rectus
look laterally and down
test for lateral rectus
look laterally
test for medial rectus
look medially
test for inferior oblique
look medially and upward
test for superior oblique
look medially and downward
what nerve innervated the lateral rectus
abducent nerve (VI)
what nerve innervated the superior oblique
trochlear nerve (IV)