Neuro Ch7

  1. What doe the Pursuit system do?
    brain controlled?
    • maintains an object on the fovea while the object moves slowly
    • Ipsilateral parietal lobe
  2. What does Verstibular Ocular Reflex (VOR)? What is the delimna of the VOR system?
    • Holds object steady on while the head moves during a pursuit
    • It doesnt last long and OKN must take up for it.
  3. How does Optokinetic Nystagmus (OKN) work with VOR?
    OKN Holds image steady on fovea during sustained head movement
  4. What does the saccade system function to do?
    Controlled in the brain where?
    • Quick movement to fast for pursuits. Rapidly brings object of interest to the fovea
    • contralateral frontal lobe
  5. What are saccadic intrusions?
    What is the mcc type
    What dz is it found?
    • unwanted eye movements during fixation
    • square wave jerks
    • Progressive supranuclear palsy
  6. Supernuclear control of saccades is initiated from the
    • contralateral Frontal Eye Fields
    • contralateral Superior Colliculus
  7. Supernuclear control of Pursuits is initiated from the
    ipsilateral parieto-occipital-temporal regions
  8. What are the vertical gaze centers?
    Neural intergrator
    • riMLF (rostral interstial nucleus of MLF)
    • midbrain
    • Interstical nucleus of Cajal
  9. What are the horizontal gaze centers?
    Neural integrator
    • Parapontine reticular formation PPRF
    • Location -PONS
    • Medial vestibular nucleus
    • nucleus prepositous hypoglossi accessory nucleus of 7
  10. How do you test the VOR? Describe each.
    • Dolls eye manuever; move head with visual fixation; if catch up saccade then abnl
    • Calorics: irrigate H20 in ear and watch for type of nystagmus base of the temp of H20
  11. Calorics interpretation:
    What is the mnemonic
    If warm water irrigated in right eye, what type of nystagmus
    If cold water irrigated in right eye what type of nystagmus
    • COWS: cold opposite/warm same
    • warm H20- right ear -righting beat nystagmus
    • cold H20- right ear -left beating nystagmus
  12. If patient is comatose which ear does the eye move in caloric testing
    toward the same side with slow phase movement
  13. What is the etiology of Ocular tilt?
    What is the disorder?
    • otolithic organs
    • head tilt
    • ocular rotation
    • skew deviation
  14. In ocular tilt which way is the head tilt and cyclotorsion in respect to the lesion?
    • same side as lesion
    • head tilted towards lower eye
  15. How do you differentiate a skew from 4th nerve palsy?
    hypertropia on opposite side of gaze (head tilt)
  16. What is the lateral medullary syndrome of wallenberg?
    • stroke without paralysis
    • Ipsi loss of pain/temp on face
    • ipsi cerebellar ataxia
    • ipsi horner
    • ocular tilt
  17. How do you test VOR suppression?
    • -pt fixate on near card while being rotated in swivel chair.
    • -nl eyes maintain fixation on near card during rotation without catch-up saccade.
    • impaired VOR eyes move off the target during rotation
Card Set
Neuro Ch7
Neuro Ch7