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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Jeannin et al., "Association between carotid bulb diaphragm and ischemic stroke in young Afro-Caribbean patients," Stroke, vol.
Caption: Figure 1: (a) Axial contrast-enhanced CT scan (soft tissue window) shows poorly delineated thickening of the left carotid bulb wall (arrow).
Carotid IMT was measured at the far wall of the common carotid artery (CCA) at a 1 cm segment 1 cm proximal to the inferior end of the carotid bulb. Carotid arterial stiffness was evaluated over the near and far walls of the CCA at the same segment (Figure 1).
Comparison of two techniques of CIMT interrogation: the technique used to measure CIMT in our control group and comparison groups avoided the 2 mm of the CCA nearest to the carotid bulb. While, in older populations, the carotid bulb is the region most likely to have focal plaque deposition resulting in dissimilar CIMT measurements to other areas of the CCA, none of the patients included in our study had focal plaque deposition in this area.
Technically, it has been usually measured in CCA, rather than the carotid bulb or internal carotid artery, because CCA is easily visualized perpendicular to the ultrasound beam and provides more accurate, reproducible, and quantitative measurement (20).
MRI provides details about how soft tissue is affected by the tumor, and it may detect carotid bulb and jugular vein occlusion.
The US findings in these three patients (with hepatitis) showed focal homogenous echogenic plaque resting on the anterior wall of the common carotid bulb that measured 5x1.8 mm at its maximum dimension in one of the males.
We only looked at the common CIMT and did not examine the intima-media thicknesses in the carotid bulb or the internal carotid artery; the evaluation of atherosclerosis in these segments may vary.
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.