conduction

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conduction

 [kon-duk´shun]
conveyance of energy, as of heat, sound, or electricity.
aberrant ventricular conduction the temporary abnormal intraventricular conduction of supraventricular impulses; called also ventricular aberration.
aerial conduction (air conduction) conduction of sound waves to the organ of hearing in the inner ear through the air.
anterograde conduction
1. forward conduction of impulses through a nerve.
2. in the heart, conduction of impulses from atria to ventricles.
atrioventricular conduction (AV conduction) the conduction of atrial impulses through the atrioventricular node and the His-Purkinje system to the ventricles.
bone conduction conduction of sound waves to the inner ear through the bones of the skull.
concealed conduction conduction that is not seen on the surface electrocardiogram but may be detected by its effect on subsequent impulses; common examples are the incomplete penetration of the AV junction during atrial fibrillation, the Wenckebach type penetration during atrial flutter, and the retrograde incomplete penetration following ventricular ectopic beats.
decremental conduction a gradual decrease in the stimuli and response along a pathway of conduction; it occurs in nerve fibers with reduced membrane potentials.
retrograde conduction transmission of a cardiac impulse backward in the ventricular to atrial direction; particularly, conduction from the atrioventricular node into the atria.
saltatory conduction the rapid passage of an electric potential between the nodes of ranvier in myelinated nerve fibers, rather than along the full length of the membrane.

con·duc·tion

(kon-dŭk'shŭn),
1. The act of transmitting or conveying certain forms of energy, such as heat, sound, or electricity, from one point to another, without evident movement in the conducting body.
2. The transmission of stimuli of various sorts by living protoplasm.
[L. con- duco, pp. ductus, to lead, conduct]

conduction

/con·duc·tion/ (-shun) conveyance of energy, as of heat, sound, or electricity.conduc´tive
aberrant conduction  cardiac conduction through pathways not normally conducting cardiac impulses, particularly through ventricular tissue.
aerotympanal conduction  conduction of sound waves to the ear through the air and the tympanum.
air conduction  conduction of sound waves to the inner ear through the external auditory canal and middle ear.
anterograde conduction  transmission of a cardiac impulse in the normal direction, from the sinus node to the ventricles, particularly forward conduction through the atrioventricular node.
Enlarge picture
Diagrammatic view of the conducting system of the heart, showing anterograde conduction of the cardiac impulse.
bone conduction  conduction of sound waves to the inner ear through the bones of the skull.
concealed conduction  incomplete penetration of a propagating impulse through the cardiac conducting system such that electrocardiograms reveal no evidence of transmission but the behavior of one or more subsequent impulses is somehow affected.
concealed retrograde conduction  retrograde conduction blocked in the atrioventricular node; it does not produce an extra P wave but leaves the node refractory to the next normal sinus beat.
decremental conduction  delay or failure of propagation of an impulse in the atrioventricular node resulting from progressive decrease in the rate of the rise and amplitude of the action potential as it spreads through the node.
retrograde conduction  transmission of a cardiac impulse backward in the ventricular to atrial direction, particularly conduction from the atrioventricular node into the atria.
saltatory conduction  the passage of a potential from node to node of a nerve fiber, rather than along the membrane.

conduction

[kənduk′shən]
Etymology: L, conducere, to lead
1 (in physics) a process in which heat is transferred from one substance to another because of a difference in temperature; a process (often electrical) in which energy is transmitted through a conductor.
2 (in physiology) the process by which a nerve impulse is transmitted. conductive, adj.
enlarge picture
Conduction of an action potential

conduction

Cardiac pacing The passage of an electrical charge; the active propagation of a depolarization wave in the heart Physiology The transmission of nerve impulses. See Retrograde conduction.

con·duc·tion

(kŏn-dŭk'shŭn)
1. The act of transmitting or conveying certain forms of energy, such as heat, sound, or electricity, from one point to another, without evident movement in the conducting body.
2. The transmission of stimuli of various sorts by living protoplasm.
3. The process by which a nerve impulse is transmitted.
[L. con-duco, pp. ductus, to lead, conduct]

conduction

the transmission of an electrical current by a conductor.

conduction

energy transmission (e.g. heat, sound, electricity) through a conducting body; heated immersion media (e.g. water; wax) transmit heat energy to tissues, with therapeutic effect, as part of the treatment of chronic inflammatory states (e.g. osteoarthritis, chronic chilling, chronic bursitis)

con·duc·tion

(kŏn-dŭk'shŭn)
Transmitting or conveying energy, from one point to another, without evident movement in conducting body.
[L. con-duco, pp. ductus, to lead, conduct]

conduction,

n the carrying of sound waves, heat, light, nerve impulses, and electricity.
conduction, air,
n the process of transmitting sound waves to the cochlea by way of the outer and middle ear. In normal hearing, practically all sounds are transmitted in this way, except those of the hearer's own voice, which are transmitted partly by bone conduction.
conduction, bone,
n the transmission of sound waves or vibrations to the cochlea by way of the bones of the cranium.
conduction, impulse,
n the conduction of an impulse along the nerve fiber, accompanied by an alteration of the electrical potential of the fiber tissue and an exchange of electrolytes across the nerve fiber membrane.

conduction, conductive

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

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