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28 Cards in this Set
- Front
- Back
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movement of one eye by itself is called a
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duction
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what is sursumduction?
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elevation of eye
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deorsumduction?
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depression of eye
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both eyes moving synchronously and symmetrically in the same direction?
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version
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dextroversion =
laevoversion = sursumversion = laevoelevation = dextrodepression = laevocycloversion = |
R gaze
L gaze Upgaze L and Up R and down L rotated |
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what is a vergence?
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both eyes move simultaneously in opposite direction
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Explain Sherrington's Law of reciprocal innervation
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* SHERRING = SHARE = SAME EYE SHARING BETWEEN MUSCLES *
RMR and RLR are antagonists of each other. As one contracts the other must relax. Sherrington's Law: For the amount of contraction innervation going to RMR the same amount of relaxation innervation must go to RLR. |
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Explain Hering's Law of Correspondence ?
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Or Hering's Law of Simultaneous Innervation. BINOCULAR.
Innervation to the yoke muscle in the non-fixing eye must equal innervation to the corresponding agonist in the fixing eye. |
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What is the contralateral synergist of the LSR?
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RIO
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What is the ipsilateral antagonist of the RIR?
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RSR
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what is the contralateral anrtagonist of the LIO?
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RIR
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what is the ipsilateral synergist of the LMR?
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LSR and LIR
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List each EOM and its primary function.
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MR: adduction
LR: abduction IR: depression SR: elevation IO: extort SO: intort |
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comitant eye misalignments measure the same in all directions of gaze.
True or False? Anythign missing from the defn? |
True
when fixing with EITHER eye |
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What is a secondary deviation?
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apparent deviation when fixing with the paretic eye
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Nuclear defects are located where?
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brainstem
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what type of deviation will a nuclear deviation produce?
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incomitant
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what type of deviation will in infranuclear deviation produce?
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incomitant - affect the nerve before innervating the EOM
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Where are the nerve nuclei for CN 3,4, and 6?
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3,4 = midbrain
6 = pons |
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Defects in which areas produce comitant deviations?
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supranuclear
internuclear |
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a patient who experiences overshoots and undershoots indicated what type of defect?
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supernuclear
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supranuclear defects refer to the highest brain centers, controlling what type of movements?
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saccades and pursuits
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will a supranuclear defect cause eye misalignment?
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No - eyes will be parallel but may be unable to move past midline to the right; may be skew deviation
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What is One and a Half syndrome? Why does it occur?
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combined unilateral conjugate gaze palsy and INO
(looks like only one LR muscle is working in the contra eye) * proximity of VI nucleus to PPRF * |
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what is an inTERnuclear defect?
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affects MLF therefore causes horizontal gaze palsy
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What is CN VIII associated with?
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hearing
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Why is a nuclear defect associated with a horizontal gaze paralysis????
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Proximity to PPRF
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Deafness is a common symptom of Duane's syndrome. On which side?
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ipsilateral
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