atrium


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atrium

 [a´tre-um] (pl. a´tria) (L.)
a chamber affording entrance, especially the upper chamber (a´trium cor´dis) on either side of the heart, transmitting to the ventricle of the same side blood received from the pulmonary veins (left atrium) and from the venae cavae (right atrium).

a·tri·um

, pl.

a·tri·a

(ā'trē-ŭm, ā'trē-ă), Do not confuse this word with antrum.
1. A chamber or cavity to which are connected several chambers or passageways.
2. Synonym(s): atrium of heart
3. That part of the tympanic cavity that lies immediately deep to the tympanic membrane.
5. In the lung, a subdivision of the alveolar duct from which alveolar sacs open.
[L. entrance hall]

atrium

(ā′trē-əm)
n. pl. atria (ā′trē-ə) or atri·ums
Anatomy A body cavity or chamber, especially either of the upper chambers of the heart that receives blood from the veins and forces it into a ventricle. Also called auricle.

a·tri·um

, pl. atria (ā'trē-ŭm, -ă) [TA]
1. A chamber or cavity to which are connected several chambers or passageways.
2. Synonym(s): atrium of heart.
3. That part of the tympanic cavity that lies immediately deep to the tympanic membrane (eardrum).
4. In the lung, a subdivision of the alveolar duct from which alveolar sacs open.
[L. entrance hall]

atrium

One of the thin-walled upper chambers of the heart which receive blood from the veins and pass it down to the lower, more powerful, pumping chambers (the ventricles).
Atriumclick for a larger image
Fig. 56 Atrium . Primitive heart.

atrium

(pl. atria) a passage or chamber in the body, particularly one or more of the chambers in the heart receiving blood from the body. All vertebrates except fish have hearts with two atrial cavities.

See also HEART and HEART, CARDIAC CYCLE.

Atrium

One of the two upper chambers of the heart.

a·tri·um

, pl. atria (ā'trē-ŭm, -ă) [TA] Do not confuse this word with antrum.
Chamber or cavity to which are connected several chambers or passageways.
[L. entrance hall]
References in periodicals archive ?
Selective M&A: Atrium has been selective in acquisitions historically, including Palac Pardubice (Czech Republic) and Focus Mall in Bydgoszcz (Poland), acquired in late 2014, as well as the acquisition of a 75% stake in Arkady Pankrac (Czech Republic) from Unibail in June 2015.
Atrium's rating is underpinned by its improved property portfolio focusing on dominant assets in Central and Eastern Europe (CEE).
It believes Atrium is improving the overall quality of its portfolio, acquiring and developing several large shopping centres in Poland and the Czech Republic.
The divestment of Atrium's biosurgery business includes all assets and liabilities relating to the biosurgery business, but excludes the mesh product liability claims raised against Atrium Medical in relation to products sold prior to closing and also the associated insurance claims of Atrium Medical.
As part of the deal, Atrium will become part of Nestle Health Science, and its existing management team will continue to manage the business, led by Peter Luther, Atrium Innovations president and CEO.
Cardiac magnetic resonance imaging showed a marked right atriomegaly (right atrium area: 66.50 [cm.sup.2], volume: 220 ml/[m.sup.2]) and normal size of the left atrium (left atrium area: 7.02 [cm.sup.2]).
Mr Zaera-Polo has told of his fears for the future of the central atrium design, now to be undertaken by London-based Haskoll - and of his 'public duty' in deciding to walk away.
In this framework the roof structure of the atrium is an issue where contemporary interpretations of material evidence are at odds with Vitruvius' textual definitions.
Robert Goodall, president and CEO, said, "The increase in our revolving credit facility positions Atrium to build shareholder value by continuing our focused program of investing in quality mortgages."
7 November 2011 - The US Federal Trade Commission (FTC) has approved the acquisition of US healthcare group Atrium Medical Inc by Sweden-based Getinge AB (STO:GETI B).
As part of the deal, which the companies reported will likely dose in the fourth quarter of 2011, Atrium will continue to be headed by president Trevor Carlton and will operate as an independent business unit of Maquet.
Sweden-based Getinge Group and its Maquet Cardiovascular subsidiary acquired Atrium Medical Corp.