Card Set Information

2011-05-24 15:33:37
grants pg

cranial nerve lesions
Show Answers:

  1. Cribriform plate fracture-CNI
    • Anosmia-loss of smell
    • rhinnorhea-CSF leakage through nose
  2. Direct trauma to orbit,eyeball or fracture to optic canal-CNII
    loss of pupillary constriction
  3. Pressure on optic pathway;laceration or intracerebral clot in temporal, parietal, occ lobes-CNII
    visual filed defects
  4. Increased CSF pressure-CNII
    papilledema-swelling of optic disc
  5. pressure from herniating uncus on nerve; fracture involving cavernous sinus; aneurysm-CNIII
    • pupil dialation
    • ptosis-droopy eyelid
    • eye rotates down & out
    • pupillary reflex on side of lesion will be lost
  6. stretching of nerve during its course around brainstem; fracture orbit-CNIV
    inability to rotate adducted eye inf
  7. Injury to CNV2(maxillary) branch in roof in max sinus; pathologic processes(tumors,aneurysms,infections)-CNV
    • loss of pain & touch sensations/paresthia on face
    • loss of corneal reflex
    • mastication musc paralysis
    • mandible deviation to side of lesion w/open mouth
  8. Base of brain or fracture involving cavernous sinus/orbit-CNVI
    • inability to rotate eye laterally
    • diplopia on lat gaze
  9. Laceration or contusion in parotid region-CNVII
    • facial musc paralysis; eye remains open; angle of mouth droops
    • forehead not wrinkle
  10. fracture of temp bone-CNVII
    • cochlear nerve & chorda tympani
    • facial musc paralysis, eye open, mouth droops & forhead not wrinkle
  11. Intracranial hematoma(stroke)-CNVII
    • paralysis of lower facial musc contralateral to lesion
    • upper facial musc not affected b/c they are bilaterally innervated
  12. Tumor of nerve-CNVIII
    • progressive unilateral hearing loss,
    • tinnitus-noises in ear
    • vertigo-loss of balance
  13. Brainstem lesion or deep laceration of neck-cNIX
    • loss of taste on post 1/3 tongue
    • loss of sensation on affected side of soft palate
    • loss of gag reflex on affected side
  14. Brainstem lesion or deep laceration of neck-CNX
    • Sagging soft palate
    • deviation of uvula to unaffected side
    • hoarseness owing to vocal cord paralysis
    • difficulty swallowing/speaking
  15. Laceration of neck-CNXI
    • sternocleidomastoid paralysis
    • trap sup fiber paralysis
    • shoulder droop
  16. Neck laceration; basal skull fractures-CNXII
    • protruded tongue deviates toward affected side
    • moderate dysarthria(disturbance of articulation