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Flashcards in eye movements Deck (15):

what are 2 main afferent paths from the eye

1. to LGN in thalamus>V1
2. to sup. Coll.


what are 2 paths from V1

dorsal - where?
ventral - what?


4 functions of eye movements and the 6 movements involved

A. keep eyes still when head moves -
1. VOR and 2. optokinetic reflex
B. change what are looking at
3. saccade
C. keep an object in fovea
4. pursuit
5. fixation
D. change the plane of an object
6. vergence


what are 2 regions involved in vert. and horiz. gaze

1. vertical - MLF in midbrain
2. horiz- PPRF in pons


what are 2 parts of the VOR

1. direct - move eye to keep in place
2. indirect - via nucleus preposteous to keep eye there once it has moved


what are neural integrators for vert. and horiz. eye movements

1. vert - INC -interstitial nucleus of Cajal
2. horiz. - NPH - nucleus prepostus hypoglossi


what is optokinetic reflex

based on visual input instead of head movement - stabilizes head during slow or constant velocity head movements


what is short path of saccadic eye movements

to SC>PPRF for reflexive movement - haven't seen object


what is long path of saccadic eye movements

V1 to prefrontal for visual memories


what is pathways of saccading right

left frontal eye field>PPRF>split to abducens and left MLF> MLF to CN3 on contra side


what are 2 paths that are added into the pursuit pathway

pontine nucleus signals to the vestibulocerebellum and this goes to the vestibular nucleus


what happens in a lesion to the frontal eye field pathways

get eyes moving away from the hemiparesis


what happens in lesion of PPRF

get eyes moving towards the hemiparesis


what happens to left eye in left MLF lesion when look straight, right, left, converge

straight - okay
right - cannot adduct
left - fine
converge - can adduct because convergence is another level


what is upgaze palsy

cannot look up, but down and horiz. are fine

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