The arteries here are close enough to the surface of the skin that the pulsations of the heart can be felt by pressing gently along these arteries.
ARTERIES OF THE NECK AND HEAD FUNCTIONS
The carotid sinus is the mild dilation that can be located at the base of the carotid artery. Within the carotid sinus there are baroreceptors which are responsible for detecting changes in blood pressure.
The carotid bodies encompass the carotid sinus and respond to the chemically based changes within the blood via tiny neurovascular organs which hold chemoreceptors.