n. a slight enlargement (dilatation) in the area where the the common carotid branches out (bifurcates) into the internal and external carotid arteries. This area contains numerous baroreceptors, mainly for blood pressure. When stimulated, they cause blood pressure to fall and heart rate to slow down.

CAROTID SINUS: "As an area of baroreceptor stimulation, the carotid sinus is innervated by Cranial Nerve IX (Glossopharyngeal)."
Cite this page: N., Pam M.S., "CAROTID SINUS," in, April 7, 2013, (accessed October 15, 2021).