A patient complains of tinnitus. Which question should the nurse ask next?

Tongue movement is primarily controlled by cranial nerve XII (hypoglossal nerve), which innervates intrinsic and extrinsic tongue muscles responsible for articulation, swallowing, and midline protrusion. Proper function reflects intact motor innervation without unilateral weakness or deviation.

Rationale:

A. Loss of CN XII function results in tongue deviation toward the affected side due to unopposed action of the contralateral genioglossus muscle. Atrophy, fasciculations, and impaired articulation may also be present. A midline protrusion would not be expected in dysfunction.

B. Intact CN XII is indicated by a tongue that protrudes straight midline without deviation. This reflects normal hypoglossal nerve motor function and balanced muscular activity of both sides of the tongue during voluntary movement.

C. CN IX (glossopharyngeal nerve) is primarily responsible for taste sensation in the posterior one-third of the tongue and swallowing reflexes. It does not control tongue protrusion, so its dysfunction would not affect midline movement.

D. Intact CN IX relates to normal gag reflex and posterior tongue sensation but does not influence tongue motor control. Midline protrusion is not dependent on glossopharyngeal nerve integrity, making this option incorrect.

Tinnitus is the perception of sound (ringing, buzzing, or roaring) without an external auditory stimulus, commonly associated with cochlear hair cell dysfunction, auditory nerve irritation, or metabolic and pharmacologic causes affecting inner ear microcirculation and neural signaling pathways.

Rationale:

A. Yawning frequency is not directly associated with tinnitus. Yawning may occur with fatigue or pressure changes in the Eustachian tube but does not provide relevant diagnostic information for identifying causes of auditory phantom perception or cochlear dysfunction.

B. Ear drainage is more consistent with external or middle ear infections such as otitis externa or otitis media. While these conditions may affect hearing, drainage is not a primary cause of tinnitus and does not identify common ototoxic or neural etiologies.

C. Antibiotic use is essential to assess because several antibiotics such as aminoglycosides are ototoxic and can damage cochlear hair cells, directly causing tinnitus. This history helps identify medication-induced auditory toxicity as a reversible or preventable cause.

D. Ear cleaning practices may contribute to external ear trauma or cerumen impaction but are not primary causes of tinnitus. While relevant to general ear health, this question is less specific than medication history in identifying inner ear toxicity causes.