Term
| what does the medial rectus do? what muscle is it complementary with? |
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Definition
| adducts the eye. lateral rectus (abducts) |
|
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Term
| what does the superior rectus do? |
|
Definition
| rotates and intorts the eye |
|
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Term
| what does the superior oblique do? |
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Definition
|
|
Term
| what are the three nerves involved with moving extraocular muscles? |
|
Definition
| cranial nerve, 3, 4, and 6 |
|
|
Term
| what does CN 4 innervate? |
|
Definition
|
|
Term
| what does CN 3 innervate? |
|
Definition
| sup and inf and medial rectus |
|
|
Term
| what does CN 6 innervate? |
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Definition
|
|
Term
| how do both eyelids open at the same time? |
|
Definition
| theres bilateral innervation from caudal subdivision to levator motor neurons |
|
|
Term
| what can cause WEber's syndrome? |
|
Definition
|
|
Term
| what nerve does Weber's syndrome harm? |
|
Definition
|
|
Term
| what happens in Weber's syndrome? |
|
Definition
| ipsilateral oculomotor palsy |
|
|
Term
| what is oculomotor palsy characterized by? |
|
Definition
| atrophy of the muscle, drooping of eyelid, pupil diameter affected |
|
|
Term
| what happens during 4th nerve palsy? |
|
Definition
| superior oblique paralysis |
|
|
Term
| what is superior oblique paralysis characterized by? |
|
Definition
| left eyeball rotates, leading to double vision |
|
|
Term
| what does someone do if they have 4th nerve palsy? |
|
Definition
|
|
Term
| what happens with 6th nerve palsy? |
|
Definition
| lateral rectus doesnt work so person cant adduct eye |
|
|
Term
| what is the vestibulo ocular reflex? |
|
Definition
| stablizes eye movements during movment |
|
|
Term
| what is the optokinetic reflex? |
|
Definition
| when your head moves slow, using visual input to hold images stable on retina |
|
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Term
| if a person quickly turns their face to the left, which scarpas ganglion will increase firing? |
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Definition
| the same side scarpas ganglion will go to the opposite side abducens nucleus which will cause that sides lateral rectus to work, and then also there will be the same side oculomotor will fire and activate medial rectus. |
|
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Term
| what is the central roadway for the fibers going back and forth for controlling horizontal eye movements? |
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Definition
|
|
Term
| how does the optokinetic system work? |
|
Definition
| visual info goes to nucleus of optic tract which goes through the vestibular cerebellum causing changes in vestibular nuclei |
|
|
Term
| what controls the horizontal gaze center? |
|
Definition
| para-median pontine reticular formation |
|
|
Term
| what input is the brainstem saccade area getting from? |
|
Definition
| frontal eye field and superior colliculus |
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