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20 Cards in this Set

  • Front
  • Back
on what fiber types is pain conducted?
a-delta (fast) and C (slow)
in what part of the interior capsule do the corticospinals run?
posterior limb
course of corticospinals through brainstem
midbrain: crus cerebri (peduncles); pons: basilar portion; medulla: pyramids (decussation)
what syndrome often seen with ICA dissection? Whats unique about this presentation?
HORNER'S syndrome, but only ptosis and miosis (no anhydrosis, because those fibers travel along external carotid)
what lesion does positive rhomberg sign suggest?
dorsal column ataxia
what is spared in ventral (anterior) spinal artery occlusion?
dorsal columns and dorsal horns
fundoscopic findings in guillain-barre
papilledema 2/2 elevated protein levels (remember albumino-cytologic dissociation)
muscle findings in cauda equina syndrome
muscle atrophy, absent quadriceps reflex and ankle jerk
cauda equina vs conus medullaris syndrome
CAUDA EQUINA: spinal roots --> unilateral pain, u/l saddle anesthesia, muscle atrophy, relatively preserved bladder/sexual function, gradual onset; CONUS MEDULLARIS: cord segments --> mild b/l pain, b/l saddle anesthesia, normal reflexes, severely impaired incontinence and bladder function, sudden onset
ventral vs dorsal trigeminothalamic tracts
ventral: pain and temp (like ventral spinothalamics); dorsal: discriminitive touch (like dorsal columns)
characteristics of trigeminal neuralgia
aka tic douloreux: recurrent paroxysms of sharp, stabbing pain in trigeminal distribution (usu in older ppl)
tx of trigeminal neuralgia
where are the cell bodies of the primary neurons in the auditory pathway?
spiral ganglion
auditory pathway from hair cells to temporal gyrus of Heschl
hair cells --> cochlear nuclei (via spiral ganglion) --> contralateral (?and ipsilateral) superior olivary nucleus (via trapezoid body) --> lateral lemniscus --> inferior colliculus --> MGN --> cortex (transverse temporal gyri of Heschl)
causes of conduction deafness (3)
interruption of passage of sound waves: 1) OBSTRUCTION (eg wax); 2) OTOSCLEROSIS; 3) OTITIS MEDIA
causes of nerve deafness
aka sensorineural: dz of cochlea, cochlear nerve, or central auditory connections; MCC is PRESBYCUSIS
what is presbycusis
age-related sensorineural deafness caused by hair cell degeneration in the organ of corti
what is weber's test?
place vibrating tuning fork on vertex of the skull
findings in weber's test in conduction vs sensorineural deafness
vibration heard more loudly in affected ear with conduction loss, more loudly in normal ear with sensorineural loss
bone conduction vs air conduction with conduction deafness
bone conduction better than air conduction