Atrioventricular bundle
a bundle of specialized muscle fibers regulating the heartbeat by conducting impulses from the right atrium to the ventricles.
atrioventricular bundle n.
see atrioventricular trunk.
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- Atrioventricular canal
atrioventricular c-n-l atrioventricular c-n-l n. the c-n-l in the embryonic heart joining the atrium to the ventricle.
- Atrioventricular canal cushion
atrioventricular c-n-l cushion atrioventricular c-n-l cushion n. either of a pair of mounds of embryonic connective tissue covered by endothelium, bulging dorsally and ventrally into the embryonic atrioventricular c-n-l, eventually growing together and dividing the c-n-l into right and left atria. also called endocardial cushion.
- Atrioventricular conduction
atrioventricular conduction atrioventricular conduction n. abbr. forward conduction of the cardiac impulse from the atria to ventricles via the atrioventricular node, represented in an electrocardiogram by the p-r interval.
- Atrioventricular dissociation
atrioventricular dissociation atrioventricular dissociation n. a condition in which the atria and ventricles contract independently, especially as resulting from the slowing of an atrial pacemaker or the acceleration of a ventricular pacemaker.
- Atrioventricular extrasystole
atrioventricular extrasystole atrioventricular extrasystole n. a premature contraction of the heart in which the stimulus arises from either the a-v node or a-v bundle. also called a-v extrasystole.