atrium

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Related to parabronchi atrium: air sac, diaphragm, hemoglobin, trachea, syrinx, alveoli, Stretch receptors

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]