Cranial Nerves 5, 7 & 8 Exam

September 22, 2015 Print Friendly Version of this page Print Get a PDF version of this webpage PDF
Introduces self
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1

Confirms name & age of patient
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1

Explains & gains consent
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1

Washes hands
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1

Exposes & positions patient
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1

Asks if patient is in pain
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1

General inspection: asymmetry, ptosis, tremor, scars (particularly behind ear)
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1

Asks patient if they have experienced any numbness/paraesthesia of face
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1

Tests light touch in 3 divisions of V nerve
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1

Offers to test sharp touch via pin prick
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1

Washes hands
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1

Inspects muscles of mastication for weakness or fasciculations
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1

Palpates bulk of masseters and temporalis. Tests strength of Pterygoids
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1

Offers to do corneal reflex, jaw jerk reflex
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1

Inspects for asymmetric wrinkling of the forehead
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1

Asks patient to raise eyebrows, close eyes against resistance
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1

Asks patient puff out cheeks against resistance and show their teeth
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1

Asks about changes in taste and hearing. Offers formal testing of taste
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1

Performs gross hearing assessment by whispering in one ear whilst distracting the other
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1

Offers to do Rinnie's and Webbers test and auroscopy
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1

Thanks patient and offers help to redress
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1

Washes hands
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1

Requests a full neurological exam for completion of exam
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1

Summarises appropriately with only key findings
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1

Offers appropriate differential diagnoses
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1

Patient global score
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1
2
Potential differentials
  • CN5 - abnormalities in sensation can be caused by facial trauma or local cancer invasion
  • CN7 - Bell's palsy if lower motor neurone lesion (forehead muscles affected)
    • Differential Ramsay Hunt syndrome for varicella zoster
    • Acoustic neuroma particularly if CN8 also affected
    • Stroke if forehead muscles spared (upper motor neurone lesion)