baroreceptors


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baroreceptors

sensors in the vascular system that respond to changes in pressure within blood vessels, generating afferent nerve impulses which elicit baroreflexes, causing appropriate corrections. The main arterial baroreceptors are in the wall of the carotid sinus on each side of the neck, where the common carotid artery divides into the internal and external carotids, and are responsible for regulation of arterial blood pressure, e.g. a rise in pressure elicits reflex reduction in peripheral resistance and/or cardiac output, via control centres in the brain stem.

baroreceptors

stretch-sensitive sensory nerve endings in principal vascular structures which trigger central nervous system reflex pressure-reducing mechanisms, to reduce systolic pressure
References in periodicals archive ?
ADNA and MAP were used to construct baroreceptor afferent function curves using logistic sigmodal function.
Contribution of baroreceptors and chemoreceptors to ventricular hypertrophy produced by sino-aortic denervation in rats.
As outlined in the introduction section, the relationship between hypoalgesia and cardiovascular reactivity may be mediated by any of the following three basic mechanisms modulated by the hypothalamus (paraventricular nucleus): baroreceptor reflex arc stimulation, endogenous opioid responsivity, and descending pain-modulating pathways (Bruehl & Chung, 2006; France & Ditto, 1996; McCubbin, 1991).
As the baroreceptors involved in this reflex regulation are effective only at buffering short term changes, major perturbations in autonomic nervous system activity would be evident only immediately after exercise cessation (Rowell, 1993).
implications for understanding baroreceptor reflex circuitry.
Generally, high cardiovascular pressure causes the baroreceptors to enhance their rate of firing to transmit more impulses via the afferent neurons and the descending pathways to the hypothalamus resulting in a reduction in vasopressin secretion which may ultimately contribute to enhanced diuretic and natriuretic responses to normalize the elevated blood pressure (19).
Bradycardia, related to manipulation of the carotid sinus baroreceptors located in the carotid bulb, may occur during the procedure just after the stent implantation and/or balloon angioplasty (Martinez-Fernandez et al.
Syncope suggests development of complications such as cardiac tamponade, obstruction of cerebral vessels or activation of cerebral baroreceptors.
PRACTICE PEARL: Clinicians may wish to keep in mind that pain fibers and baroreceptors in the myometrium respond to stretching of the uterus as a result of distention and to contact with the uterine walls--but they are only minimally responsive to electrical stimulation, heat, or cold.
ORLANDO -- An innovative implantable device therapy that stimulates baroreceptors safely achieved dramatic long-term blood pressure reduction in patients with refractory hypertension in a phase II study.
2 BRS reflects mainly vagal modulation of the HR by the arterial baroreceptors and the magnitude of response in heart beat interval to a change in blood pressure (ms/mmHg).
Osmoreceptors in the hypothalamus and heart/blood vessel baroreceptors detect changes in plasma concentrations, producing or reducing anti-diuretic hormone (ADH) concentrations to increase, or decrease water absorption respectively (von Duvillard, 2004).