Atrioventricular node
a small mass of muscular fibers at the base of the wall between the atria, conducting impulses received from the sinoatrial node by way of the atrioventricular bundles and, under certain conditions, functioning for the sinoatrial node as pacemaker of the heart.
Abbreviation: A-V node.
atrioventricular node n.
A small mass of specialized cardiac muscle fibers, located near the ostium of the coronary sinus and giving rise to the atrioventricular bundle of the conduction system of the heart. Also called A-V node.
atrioventricular node
(ā’trē-ō-věn-trĭk’yə-lər)
A small area of specialized cardiac muscle cells that conducts impulses from the sinoatrial node to the ventricles and initiates the contraction of the ventricles. It is located in the right atrium.
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atrioventricular septum atrioventricular septum n. The small part of the membranous septum of the heart just above the septal cusp of the tricuspid valve, separating the right atrium from the left ventricle.
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atrioventricular trunk atrioventricular trunk n. The bundle of cardiac muscle fibers that begins at the atrioventricular node and passes through the right atrioventricular fibrous ring to the membranous part of the interventricular septum. Also called atrioventricular bundle, His bundle, ventriculonector.
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. (of a sail) in position and ready for trimming. (of a yard) hoisted and ready to be fastened in position. (of an upper mast) unfastened and ready for lowering. Historical Examples Her anchor was atrip, that is, the cable was hove short, showing that she was ready to sail at a moment’s notice. Equatorial […]
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Architecture. Also called cavaedium. the main or central room of an ancient Roman house, open to the sky at the center and usually having a pool for the collection of rain water. a courtyard, flanked or surrounded by porticoes, in front of an early or medieval Christian church. a skylit central court in a contemporary […]
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not . atoxic a·tox·ic (ā-tŏk’sĭk) n. Not toxic.