Atrium may refer to:
Atrium may refer to:
  • Atrium (architecture)
    Atrium (architecture)
    In modern architecture, an atrium is a large open space, often several stories high and having a glazed roof and/or large windows, often situated within a larger multistory building and often located immediately beyond the main entrance doors...

    , a large open space within a building usually with a glass roof
  • Atrium (alveoli)
    Pulmonary alveolus
    An alveolus is an anatomical structure that has the form of a hollow cavity. Found in the lung parenchyma, the pulmonary alveoli are the dead ends of the respiratory tree, which outcrop from either alveolar sacs or alveolar ducts, which are both sites of gas exchange with the blood as well...

    , microscopic air sacs in lungs
  • Atrium (heart), an anatomical structure of the heart
  • Atrium of the ventricular system
    Ventricular system
    The ventricular system is a set of structures containing cerebrospinal fluid in the brain. It is continuous with the central canal of the spinal cord.-Components:The system comprises four ventricles:* right and left lateral ventricles* third ventricle...

     of the brain
  • Atrium (Cardiff)
    Atrium (Cardiff)
    ATRiuM is a campus of the University of Glamorgan, in Cardiff, Wales.Opened on 29 November 2007, it is home to one of the University's five faculties, CCI...

    , a University of Glamorgan (Wales) building in Cardiff
  • atrium, the genital structure next to the genital aperture in the reproductive system of gastropods
    Reproductive system of gastropods
    The reproductive system of gastropods varies greatly from one group to another within this very large and diverse taxonomic class of animals...

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