Signs
 

Reduced Facial Sensation

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Overview

    • How to Elicit

    • Using a piece of cotton wool, lightly touch the patient's face over the three trigeminal areas of innervation, moving from side to side.
    • Causes of Reduced Facial Sensation

    • CNS lesion (cortical, thalamic or brainstem) - ischaemia, tumour, haemorrhage
    • Peripheral nerve lesion - trauma, tumour, ICA aneurysm, cavernous sinus thrombosis, SLE
    • Interpretation

    • Loss in the distribution of a single branch (V1 / V2 / V3) - suggests a peripheral nerve lesion
    • Reduced sensation on one side in all branches - suggests a contralateral sensory cortical or thalamic lesion, or an ipsilateral brainstem lesion
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