Definition of sinoatrial node in English:

sinoatrial node

Syllabification: si·no·a·tri·al node
Pronunciation: /ˌsīnōˈātrēəl ˌnōd
 
/

noun

Anatomy
  • A small body of specialized muscle tissue in the wall of the right atrium of the heart that acts as a pacemaker by producing a contractile signal at regular intervals.
    More example sentences
    • This activity arises not from excitatory nerve fibres, but spontaneously within the heart itself from a small clump of pacemaker cells near the point where the vena cava joins the right atrium: the sino-atrial node.
    • The classical concept of the source of cardiac rhythm is that it originates from the sino-atrial node.
    • Procoralan exclusively reduces heart rate by a specific action on the sino-atrial node.

Origin

early 20th century: from sinus + atrial (see atrium).

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