2015
DOI: 10.1002/jmor.20502
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Location and functional characterization of the right atrioventricular pacemaker ring in the adult avian heart

Abstract: Previous histological studies showed that in addition to a sinus node, an atrioventricular (AV) node, an AV bundle, left and right bundle branches, birds also possess a right AV-Purkinje ring that is located in the atrial sheet of the right muscular AV-valve along all its base length. The functionality of the AV-Purkinje ring is unknown. In this work, we studied the topology of pacemaker myocytes in the atrial side of the isolated chicken spontaneously contracting right muscular AV-valve using the method of mi… Show more

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Cited by 8 publications
(8 citation statements)
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“…Our investigations in anesthesia suggest such an explanation, because electrical activation of the ventricular myocardium via the AV node region needs much more time in our cases. It is possible that the atrioventricular ring bundle of pacemaker and conducting cells in the muscular atrial layer of the right AV valve provide this rapid and uniform electrical excitation of this muscular valve [3,5,6,50].…”
Section: Discussionmentioning
confidence: 99%
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“…Our investigations in anesthesia suggest such an explanation, because electrical activation of the ventricular myocardium via the AV node region needs much more time in our cases. It is possible that the atrioventricular ring bundle of pacemaker and conducting cells in the muscular atrial layer of the right AV valve provide this rapid and uniform electrical excitation of this muscular valve [3,5,6,50].…”
Section: Discussionmentioning
confidence: 99%
“…In contrast, the right AV valve is an oblique muscular flap of the right-ventricular free wall and consists of atrial and ventricular myocardial parts [1,3]. The right AV is closely linked to an atrioventricular ring bundle of pacemaker and conducting myocytes (formerly known as AV-Purkinje ring), an important part of the conducting system of the avian heart [1,[3][4][5][6]. The function of the left AV valve is the passive closure of the AV orifice depending on the pressure gradient [1,2].…”
Section: Introductionmentioning
confidence: 99%
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“…Transverse diagram showing the connections of the chicken right muscular atrioventricular valve to the right ventricle free wall and to the interventricular septum (schematic section at the level of the atrioventricular junction). Adapted and modified from Prosheva & Kaseva (). Aov, aortic valve; ivs, interventricular septum; lavv, left atrioventricular valve; lv, left ventricle; ravv, right muscular atrioventricular valve; pav, pulmonary artery valve; rv, right ventricle; a, part of the free edge of the valve, attached to the right ventricle free wall; b, region of the valve junction with the ventral side of the interventricular septum; c, basis of the valve; d, region of the valve junction with the dorsal side of the interventricular septum; e, free edge of the valve.…”
Section: Resultsmentioning
confidence: 99%
“…The black asterisk shows the place of the ventral septal attachment of the right muscular atrioventricular valve. Adapted and modified from Prosheva & Kaseva (). (C) Photograph of the ventricular surface of the right muscular atrioventricular valve; Ao, aorta; af, annulus fibrosus; cs, coronary sinus; ivs, interventricular septum; la, left atrium; ravv, right muscular atrioventricular valve; ra, right atrium; rv, right ventricle; a, part of the free edge of the valve, attached to the right ventricle free wall; b, area of the valve junction with the ventral side of the interventricular septum; c, base of the valve; d, area of the valve junction with the dorsal side of the interventricular septum; e, free edge of the valve.…”
Section: Methodsmentioning
confidence: 99%