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1. (n.) sinoatrial node
a small mass of tissue in the right atrium functioning as pacemaker of the heart by giving rise to the electric impulses that initiate heart contractions.
Etymology: (1920–25; sin (us ) + -o - +atrial)
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| Definition of 'sinoatrial node' |
Princeton's WordNet |
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1. (noun) pacemaker, cardiac pacemaker, sinoatrial node, SA node
a specialized bit of heart tissue that controls the heartbeat
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| Definition of 'sinoatrial node' |
U.S. National Library of Medicine |
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1. sinoatrial node
The small mass of modified cardiac muscle fibers located at the junction of the superior vena cava (VENA CAVA, SUPERIOR) and right atrium. Contraction impulses probably start in this node, spread over the atrium (HEART ATRIUM) and are then transmitted by the atrioventricular bundle (BUNDLE OF HIS) to the ventricle (HEART VENTRICLE).
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Definitions of sinoatrial node 
