Carotid Sinus

(redirected from carotid bulb)
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Related to carotid bulb: carotid artery, Carotid stenosis

carotid sinus

[kə′räd·əd ′sī·nəs]
An enlargement at the bifurcation of each carotid artery that is supplied with sensory nerve endings and plays a role in reflex control of blood pressure.

Carotid Sinus


(bulbus caroticus, sinus caroticus, the dilated area of the common carotid artery before bifurcation into its external and internal branches.

The carotid sinus is an important reflexogenic zone that plays a part in maintaining the constancy of arterial pressure, heart action, and blood gases content; it is the site of baroreceptors, which react to changes in blood pressure, and chemoreceptors, which react to changes in the chemical composition of the blood and in oxygen tension. The carotid sinus is innervated by the sensory branch of the glossopharyngeal nerve (sinus nerve, Hering’s nerve). Excitation of the nerve endings in the carotid sinus is the first link in the chain of the carotid reflexes.


References in periodicals archive ?
The mid and distal portions of the common carotid artery, carotid bulb, and the proximal portions of the internal and external carotid arteries were systematically examined manually in short-axis and long-axis views.
With the patient in a supine position with slight cervical hyperextension, the CIMT measurements were assessed in a sagittal plane, 1 cm proximal to the carotid bulb on the posterior wall of a plaque-free region.
Stenosis is most significant at the carotid bifurcation, also known as the carotid bulb, where the common carotid artery branches into the internal and external carotid arteries.
Other exams which are important in the general evaluation-phase of a carotid bulb paragangliomas are endocrine study and 123I-MIBG scan.