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sinoatrial node

   Also found in: Medical, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
sinoatrial node
n.
A small mass of specialized cardiac muscle fibers located in the posterior wall of the right atrium of the heart that acts as a pacemaker by generating at regular intervals the electric impulses of the heartbeat. Also called sinoauricular node, sinus node.
sinoatrial node  (sn-tr-l)
A small mass of specialized cardiac muscle fibers that acts as a pacemaker by initiating and maintaining normal heartbeat and cardiac rhythm. It is located in the right atrium.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.sinoatrial node - a specialized bit of heart tissue that controls the heartbeat
cardiac pacemaker, SA node, pacemaker
cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction
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The pacemaker of the heart is called sinoatrial node.
Arrhythmia,Causes and Treatments by harryjackson / Health, general community
The trigger for the atrium to contract is an electrical signal sent from what is known as the Sinoatrial Node (or SV Node).
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In AF, the atria of the heart are stimulated by abnormal electrical impulses from the sinoatrial node and malfunctioning atrial tissue, resulting in an irregular and disorganized heart beat.
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