A 65-year-old amn is brought to the emergency department after he passed away 30 minutes ago. He was shaving his bear and felt a lightheadedness while shaving around his neck. He has a same episode befor when a physician in ER tried to put a neck collar, blood pressure was 70/40 mm Hg and pulse was 45/min during that episode. 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?

Question

A 65-year-old amn is brought to the emergency department after he passed away 30 minutes ago. He was shaving his bear and felt a lightheadedness while shaving around his neck. He has a same episode befor when a physician in ER tried to put a neck collar, blood pressure was 70/40 mm Hg and pulse was 45/min during that episode.  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?

Quizplus · Accepted Answer

Eductional Objective: The carotid sinus is a dilation of the internal carotid artery located just above the bifurcation of the common carotid artery.  The carotid sinus reflex has an afferent limb that arises from the baroreceptors in the carotid sinus and travels to the vagal nucleus and medullary centers via the glossopharyngeal nerve (CN IX); the efferent limb carries parasympathetic impulses via the vagus nerve (CN X)

A 65-Year-Old Amn Is Brought to the Emergency Department After