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sinoatrial node
[ sahy-noh-ey-tree-uhl, sahy- ]
noun
, Anatomy.
- 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.
sinoatrial node
/ sī′nō-ā′trē-əl /
- 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.
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Word History and Origins
Origin of sinoatrial node1
1920–25; sino- + atrial ( def )
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