conduction system

conduction system,

specialized tissue that carries electrical impulses, such as bundle branches and Purkinje fibers in the heart.

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conduction, conductive

conveyance of energy, as of heat, sound or electricity.

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accessory tract atrioventricular conduction

permits a sinus impulse from the atria to ventricles to precede that carried by the normal atrioventricular conduction system. Arrhythmia results, the particular electrocardiographic characteristics depending on the pathway(s) involved. See also wolff-parkinson-white syndrome.

aerial conduction, air conduction

conduction of sound waves to the organ of hearing through the air.

conduction anesthesia

local anesthesia produced by the injection of an anesthetic agent close to a nerve in order to prevent transmission of nerve impulses along it.

bone conduction

conduction of sound waves to the inner ear through the bones of the skull.

conduction disorder

abnormalities in the conduction pathways of the heart.

James accessory conduction

see james fibers.

conduction system

the system comprises the sinoatrial and atrioventricular nodes, atrioventricular bundle and Purkinje fibers.

Conduction system of the heart. By permission from Cunningham JG, Textbook of Veterinary Physiology, Saunders, 2002

conduction time

an indicator of a peripheral nerve's ability to carry an impulse; measured during electromyography. A nerve that has undergone Wallerian degeneration is unable to carry an impulse. Severe loss of myelin results in a prolonged conduction time.

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conduction system

systema conducens cordis Anatomy A network of specialized nerve fibers innervated by both the sympathetic–SNS and parasympathetic nervous systems–PNS; PNS stimulation, eg, ↑ vagal stimulation, ↓ sinus node automaticity and ↓ AV nodal conduction; SNS stimulation ↑ automaticity, enhances conduction. See Atrioventricular node, Sinus node.