| 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 (s  n -  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
| Noun | 1. | sinoatrial node - a specialized bit of heart tissue that controls the heartbeat cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction |
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