The glossopharyngeal nerve (IX) is associated with which functions?

The glossopharyngeal nerve (IX) is associated with which functions?

• A. General sensation and chewing
• B. Taste and innervation of the tongue and pharynx
• C. Eye movement
• D. Tongue movement

Answer: (B)

Glossopharyngeal nerve handles sensory and some motor roles in the pharynx and tongue, together with autonomic innervation to the parotid gland. The key functions are taste from the posterior third of the tongue and general sensation from the tongue and pharynx. That combination—taste plus sensory innervation of the tongue and pharynx—is exactly what the option describes, making it the best fit. Other options don’t fit because eye movement is controlled by cranial nerves III, IV, and VI; tongue movement mainly involves the hypoglossal nerve (and a pharyngeal muscle called stylopharyngeus is innervated by IX, but IX itself isn’t responsible for tongue movement). General sensation and chewing points to trigeminal pathways for mastication and facial sensation, not IX.

Glossopharyngeal nerve handles sensory and some motor roles in the pharynx and tongue, together with autonomic innervation to the parotid gland. The key functions are taste from the posterior third of the tongue and general sensation from the tongue and pharynx. That combination—taste plus sensory innervation of the tongue and pharynx—is exactly what the option describes, making it the best fit.

Other options don’t fit because eye movement is controlled by cranial nerves III, IV, and VI; tongue movement mainly involves the hypoglossal nerve (and a pharyngeal muscle called stylopharyngeus is innervated by IX, but IX itself isn’t responsible for tongue movement). General sensation and chewing points to trigeminal pathways for mastication and facial sensation, not IX.