Definition of sino-atrial in English:


Line breaks: sino-atrial
Pronunciation: /ˌsʌɪnəʊˈeɪtrɪəl


  • Relating to or denoting a small body of specialized muscle tissue (the sino-atrial node) in the wall of the right atrium of the heart, whose contractions regulate the heartbeat.
    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.


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

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a small amount; a little