The afferent limb of the carotid sinus reflex is primarily carried by which nerve?

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Baroreceptors in the carotid sinus monitor blood pressure and send their signals to the brainstem primarily through the glossopharyngeal nerve, via its carotid sinus branch. This afferent pathway carries information to the nucleus tractus solitarius, initiating the reflex that adjusts heart rate and vascular tone. The vagus nerve then mediates the efferent response to slow heart rate and reduce blood pressure. The aortic arch baroreceptors feed their afferents mainly through the vagus, not the glossopharyngeal nerve, and the hypoglossal and trigeminal nerves aren’t involved in this reflex arc.