Which cranial nerve carries sensory information from the upper respiratory tract to the brainstem?

Which cranial nerve carries sensory information from the upper respiratory tract to the brainstem?

• A. Trigeminal nerve (CN V)
• B. Facial nerve (CN VII)
• C. Glossopharyngeal nerve (CN IX)
• D. Vagus nerve (CN X)

Answer: (A)

Sensory input from the upper airway, especially the nasal mucosa, travels primarily with the trigeminal nerve. This nerve carries general somatic sensation from the face and much of the nasal cavity, with branches from the ophthalmic and maxillary divisions supplying the nasal mucosa. Signals such as touch, pain, and temperature from these areas enter the brainstem at the trigeminal nuclei for processing. Other nerves do carry sensation from parts of the throat and airway—glossopharyngeal nerve for the oropharynx and posterior tongue, vagus nerve for the laryngopharynx and larynx—but the nasal passages are innervated predominantly by the trigeminal nerve. Therefore, the trigeminal nerve is the main conduit for sensory information from the upper respiratory tract to the brainstem.

Sensory input from the upper airway, especially the nasal mucosa, travels primarily with the trigeminal nerve. This nerve carries general somatic sensation from the face and much of the nasal cavity, with branches from the ophthalmic and maxillary divisions supplying the nasal mucosa. Signals such as touch, pain, and temperature from these areas enter the brainstem at the trigeminal nuclei for processing. Other nerves do carry sensation from parts of the throat and airway—glossopharyngeal nerve for the oropharynx and posterior tongue, vagus nerve for the laryngopharynx and larynx—but the nasal passages are innervated predominantly by the trigeminal nerve. Therefore, the trigeminal nerve is the main conduit for sensory information from the upper respiratory tract to the brainstem.