bundle /bun·dle/ (bun´d'l) a collection of fibers or strands, as of muscle fibers, or a fasciculus or band of nerve fibers.
atrioventricular (AV) bundle,
atrioventricular bundle
atrioventricular bundle , AV bundle bundle of His.
common bundle the undivided portion of the bundle of His, from its origin at the atrioventricular node to the point of division into the right and left bundle branches.
bundle of His a band of atypical cardiac muscle fibers connecting the atria with the ventricles of the heart, occurring as a trunk and two bundle branches; it propagates the atrial contraction rhythm to the ventricles, and its interruption produces heart block. The term is sometimes used specifically to denote only the trunk of the bundle. 
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Bundle of His considered as the trunk of the bundle and excluding the bundle branches.
medial forebrain bundle a group of nerve fibers containing the midbrain tegmentum and elements of the limbic system.
Thorel's bundle a bundle of muscle fibers in the human heart connecting the sinoatrial and atrioventricular nodes.
| atrioventricular bundle n. See bundle of His. |
atrioventricular (AV) bundle,
a band of atypical cardiac muscle fibers with few contractile units. It arises from the distal portion of the AV node and extends across the AV groove to the top of the interventricular septum, where it divides into the bundle branches. Also called bundle of His.
atrioventricular
pertaining to an atrium and ventricle of the heart.
accessory tract atrioventricular conduction
atrioventricular block
see atrioventricular heart block.
atrioventricular bundle
bundle of His.
common atrioventricular canal
a congenital cardiac defect in which both sides of the heart share the same atrioventricular orifice. Called also persistent atrioventricular canal, atrioventricularis communis.
atrioventricular node
a mass of cardiac muscle fibers (Purkinje fibers) lying on the right lower part of the interatrial septum of the heart. Its function is the transmission of the cardiac impulse from the sinoatrial node to the muscular walls of the ventricles. The conductive system is organized so that transmission is slightly delayed at the atrioventricular node, thus allowing time for the atria to empty their contents into the ventricles before the ventricles begin to contract.
partitioning atrioventricular canal
during embryological development partitioning of the cardiac chambers and their orifices may be incomplete, leading to fatal cardiac defects, e.g. persistent atrioventricular chamber.
persistent common atrioventricular canal
atrioventricular stenosis
left and right atrioventricular stenosis are recorded; the former is an acyanotic defect, the latter is more serious and a cyanotic defect.
atrioventricular trunk
see bundle of His.
atrioventricular valvular disease
may be identifiable on finding of systolic murmur (incompetent valve) or diastolic murmur (stenotic valve) over the apex of the heart with maximum audibility over the left or right sides, depending on the side involved.
Wenckebach atrioventricular block
see Mobitz atrioventricular heart block.
bundle
a collection of fibers or strands, as of muscle fibers, or a fasciculus or band of nerve fibers.
accessory bundle of Kent
bundle of His.
atrioventricular bundle
bundle of His.
Bachmann bundle
a large muscle bundle between the right and left atria, thought to serve as a specialized conduction pathway.
bundle branch
see bundle branch.
fundamental bundle
that part of the white matter of the spinal cord bordering the gray matter and containing fibers that travel for a distance of only a few segments of the cord. Called also ground bundle.
bundle of His
a band of atypical cardiac muscle connecting the atria with the ventricles of the heart; called also atrioventricular bundle.
His bundle degeneration
associated with sudden unexpected death or periods of viciousness; most common in Doberman and German shepherd dogs.
His bundle stenosis
inherited in Pug dogs; associated with syncope and sudden death.
Keith's bundle
a bundle of fibers in the wall of the atrium of the heart between the venae cavae.
medial forebrain bundle
a group of nerve fibers connecting the midbrain tegmentum and elements of the limbic system.
sinoatrial bundle
Keith's bundle.
Thorel's bundle
a bundle of muscle fibers in the human heart connecting the sinoatrial and atrioventricular nodes.
uncinate bundle
the sharply bent bundle that connects the frontal lobe of the brain with the temporal and occipital lobes.
bundle of Vicq d'Azyr
a band of fibers from the mamillary body to the anterior nucleus of the thalamus.
atrioventricular bundle
Bundle of His, AV bundle Anatomy A group of specialized cardiac fibers that conduct impulses from the AV node to the ventricle
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