CN Flashcards
What is the most common cause of anosia
Common cold
What is the best way of testing visual acuity?
Snellen chart
what does 6/12 and 6/6 in snellen chart mean?
6 meters and size 12 writing
6 meters and size 6 writing (normal)
If no papillary response is achieved how can you determine the affected cranial nerve?
With the response of the consensual eye:
no-response= CN2 because no stimulus is sent out
response = CN 3 different in PNS
Which nerves are tested by corneal reflex
efferent => CNV opthalmic
afferent => CN VII zygomatic => orbicularis oculi
In what condition one would find it easier to read distant text to one placed closer and why
Presbyopia, reduced focusing power with age due to harder flattened lenses
What problem would you suspect with Miosis and unresponsiveness of pupil? what other signs would you look for?
Horner’s syndrome, prosis => superior tarsu loss
vasodilation
anhydrosis
definition of Strabisus
missaligment of eyes that leads to amyblopia
What is meant by ambylopia
ignoring of one eye due to defect that would otherwise lead to double vision
what would be a sign of mandibular nerve palsy
divination of mandible towards affected site and loss of sensation in lower face
what branches of CN VII are tested by appropriate movements and what are the muscles involved
frontalis => temporal=> raise eyebrows
orbicularis oculi=> temporal and zygomatic => screw up eyes orbicularis oris and buccinator => buccal =>smile and blow up cheeks
what are the abnormal findings with Weber test and why
If sound is louder in ear A it may indicate that
• There is a conductive hearing loss in ear A (no background noise)
• There is a sensory hearing loss in ear B
what are the abnormal findings with Rinne test
bone louder => conductive loss
