Wikipedia
Carotid sinus
In human anatomy, the carotid sinus is a dilated area at the base of the internal carotid artery just superior to the bifurcation of the internal carotid and external carotid at the level of the superior border of thyroid cartilage. The carotid sinus extends from the bifurcation to the "true" internal carotid artery {Pellerito & Polak 2012}. The carotid sinus is sensitive to pressure changes in the arterial blood at this level. It is the major baroreception site in humans and most mammals.
Usage examples of "carotid sinus".
I was pleased with them, certainly not angry, but the carotid sinus works also in reverse.
I was unaware of the pulse in the carotid sinus, and that was normal at a time like this.