Anatomy
atrium Audio
a·tri·um [ ey-tree-uhm ]
Subclass of:
Heart
Definitions related to heart atrium:
  • (heart, atrium) The smaller chamber(s) of the heart that receives blood from the peripheral circulation and/or the lungs.
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
  • (atrium) General anatomical term which refers to a chamber or cavity to which are connected one or more chambers or passageways. Examples: right atrium of heart, atrium of middle nasal meatus, atrium of tympanic cavity, atrium of alveolus.
    Foundational Model of Anatomy
    University of Washington, 2017
  • (atrial) Of or relating to a cavity or chamber in the body, especially one of the upper chambers of the heart.
    NCI
    U.S. National Cancer Institute, 2021
  • (atrium) One of the heart's two upper chambers (the plural form is atria). The right atrium receives deoxygenated blood from the body; the left atrium receives oxygenated blood from the lungs.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • (atrium) Upper right or left chambers of the heart.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • (heart atria) The chambers of the heart, to which the BLOOD returns from the circulation.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (cardiac atrium) Cardiac chamber which consists of a wall that surrounds the cavity of an atrium.
    Foundational Model of Anatomy
    University of Washington, 2017
  • (cardiac atrium) The paired upper chambers of the heart. The left atrium receives oxygenated blood from the pulmonary vein and pumps blood into the left ventricle. The right atrium receives venous deoxygenated blood from the entire body via the superior and inferior vena cavae and pumps blood into the right ventricle.
    NCI
    U.S. National Cancer Institute, 2021
  • Atrium, in vertebrates and the higher invertebrates, heart chamber that receives blood into the heart and drives it into a ventricle, or chamber, for pumping blood away from the heart. Fishes have one atrium; amphibians, reptiles, birds, and mammals, two. In humans the atria are the two upper...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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