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19 Cards in this Set
- Front
- Back
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what type of lesion is most likely to present with gaze paresis?
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supranuclear
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what type of lesion is most likely to present with diplopia?
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internuclear or infranuclear
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you ask your patient to look to the left without moving their head. you notice that neither the right or left eye moves at all. where is the lesion?
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this is a CN VI nuclear lesion (nucleus for CN VI is located in the pons)
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what is the name of a lesion inside the brainstem?
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fascicular lesion
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you ask your patient to look to the right without moving their head. you notice that the right eye does not move but the left eye moves medially. where is the lesion?
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this is a postnuclear lesion of CN VI in the right hemisphere
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how will a CN VI internuclear lesion present?
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ipsalateral gaze palsy (they won't be able to look to the side that has the lesion)
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how will a CN VI infranuclear lesion present?
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the ipsalateral eye will have weakness or paralysis while the contralateral eye will be normal
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how will demyelinating fascicular CN VI lesion most likely present?
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diplopia and hemiparesis in the ipsalateral eye
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where is the CN VI nucleus located?
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posterior medial pons
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where is the CN III nucleus located?
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in the midbrain at the level of the superior colliculus
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patient comes into your office and their left eye is looking down and out. what is the most likely diagnosis?
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left CN III nucleus lesion
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ischemia in CN III will cause what manifestations?
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extra ocular muscle paralysis
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compression to CN III will cause what manifestations?
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extra ocular muscle paralysis and pupil dilation
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which extra ocular muscle is most likely to be involved in abberent fiber growth after damage to CN III? how will this present clinically?
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medial rectus
everytime you have the person look in a way that activates the medial rectus the pupil will constrict |
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what muscle does CN IV innervate?
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superior oblique
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what muscle does CN VI inneravte?
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lateral rectus
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what cranial nerve is most vulnerable to trauma?
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CN IV
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a patient comes into your office with her head tilt to the right. she says that if she straightens her head it causes her to see double. what is the most likely diagnosis?
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post nuclear lesion to the left CN IV
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how will a patient with a CN IV lesion present?
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with their head tilted in a contralateral direction of the lesion. if they keep their head straight they will have diplopia
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