atrioventricular junction

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Related to atrioventricular junction: AV junctional rhythm


a place of meeting or coming together. adj., adj junc´tional.
atrioventricular junction in the conduction system of the heart, the junction between the atrioventricular node and the nonbranching portion of the bundle of His.
cementoenamel junction the line at which the cementum covering the root of a tooth meets the enamel covering the crown.
gap junction a narrowed portion of the intercellular space, containing channels linking adjacent cells and through which can pass ions, most sugars, amino acids, nucleotides, vitamins, hormones, and cyclic AMP. In electrically excitable tissues the gap junctions serve to transmit electrical impulses via ionic currents and are known as electrotonic synapses; they are present in such tissues as myocardial tissue.
myoneural junction (neuromuscular junction) the site of junction of a motor nerve fiber and a skeletal muscle fiber that it innervates. The discoid expansion of the terminal branch of the axon forms the motor end plate, the neurotransmitter that diffuses across the synapse is acetylcholine.
sclerocorneal junction limbus (def. 2).
ureteropelvic junction the area where the renal pelvis meets the ureter.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

atrioventricular junction

The area of cardiac conduction pathway connecting the AV node with the atrioventricular bundle.
See also: junction
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
Typical findings include apical displacement of the proximal attachment of the septal and posterior tricuspid valve leaflets greater than 8 mm/[m.sup.2] body surface area or 1.2 cm in length, redundancy and fenestrations of the anterior tricuspid valve leaflet, and dilation of the anatomic tricuspid valve annulus at the atrioventricular junction [2, 3, 7].
Length was measured from ascending aorta to the apex of the heart, while width was measured at the level of atrioventricular junction.
Catheter-induced ablation of atrioventricular junction to control refractory supraventricular arrhythmias.

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