Which nerve carries the afferent signal from the baroreceptors of the carotid sinus to the medulla?
Answer and explanation
Correct answer: A. The glossopharyngeal nerve (cranial nerve IX)
- Step 1: The carotid sinus is innervated by the sinus nerve of Hering, a branch of cranial nerve IX. Step 2. The aortic arch baroreceptors use the vagus nerve instead. Answer: the glossopharyngeal nerve. Why not the others: the vagus carries aortic arch signals, and nerves XI and XII are not baroreceptor afferents.
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