A 65-Year-Old Man Reports Multiple Episodes of Lightheadedness While Buttoning

A 65-year-old man reports multiple episodes of lightheadedness while buttoning a tight shirt collar.  During 2 episodes, he passed out briefly but sustained no injuries.  His blood pressure was 70/40 mm Hg and pulse was 45/min during one of the episodes.  Past medical history is significant for hypertension and diet-controlled diabetes mellitus.  The patient is a lifetime nonsmoker and drinks alcohol on social occasions.  On physical examination, his blood pressure is 125/72 mm Hg and pulse is 76/min without orthostatic changes.  Stimulation of afferent sensory fibers in which of the following nerves is most likely responsible for this patient's symptoms?

A) Accessory
B) Glossopharyngeal
C) Hypoglossal
D) Trigeminal
E) Vagus

Correct Answer:

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