The gag reflex is a reflex contraction of the soft palate. It is tested for by touching the back of the patients pharynx on each side with a spatula. The sensation of the spatula is mediated via the IXth cranial nerve, and the reflex contraction of the soft palate is mediated via the vagus - Xth - cranial nerve.
The examiner should ask the patient whether they can feel the spatula at the back of the pharynx. The absence of contraction of the soft palate with sensation of the spatula indicates a Xth nerve palsy.
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