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sinoatrial node

[ sahy-noh-ey-tree-uhl, sahy- ]

noun

, Anatomy.
  1. 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-ātrē-əl /

  1. 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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sino-Sino-Japanese War