During history taking, a client reports difficulty swallowing. To assess the appropriate cranial nerve, the nurse should observe which response?

• A. Cranial nerves IX and X
• B. Cranial nerve II
• C. Cranial nerve XII
• D. Cranial nerve V

Answer: (A)

When a client reports difficulty swallowing, the nerves that coordinate the swallowing and protective airway reflexes are the ones to assess. The gag reflex tests the function of the glossopharyngeal nerve (sensory input from the oropharynx) and the vagus nerve (motor output to the pharyngeal muscles). Observing this reflex—often by lightly touching the posterior pharynx or asking the patient to swallow and watching for a coordinated pharyngeal response—directly evaluates those pathways. If the gag reflex is present and a swallow occurs appropriately, IX and X are likely functioning well. The other nerves listed aren’t the primary ones tested by this reflex: the optic nerve governs vision; the hypoglossal nerve controls tongue movement (useful to assess separately in swallowing, but not via the gag reflex); and the trigeminal nerve affects chewing and facial sensation.