https://wikimd.com/index.php?action=history&feed=atom&title=Primitive_atriumPrimitive atrium - Revision history2026-04-20T00:54:10ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.com/index.php?title=Primitive_atrium&diff=6306108&oldid=prevPrab: CSV import2025-02-17T01:54:49Z<p>CSV import</p>
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<p><b>New page</b></p><div>'''Primitive atrium''' is a term used in [[embryology]] to refer to the initial stage of the development of the [[atrium (heart)|atrium]] in the [[heart]]. The primitive atrium is a part of the [[primitive heart tube]], which is the earliest stage of heart development in the embryo. The primitive atrium later gives rise to the two atria of the adult heart.<br />
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==Etymology==<br />
The term "primitive atrium" comes from the Latin "primitivus", meaning first or original, and "atrium", which in anatomical terms refers to a chamber or cavity. In this context, it refers to the first, or original, stage of the atrium in heart development.<br />
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==Development==<br />
The primitive atrium forms during the third week of [[embryonic development]]. It originates from the cranial part of the primitive heart tube, which itself is derived from the [[mesoderm]] layer of the embryo. The primitive atrium initially forms as a single chamber, but it soon divides into the right and left atria.<br />
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==Related terms==<br />
* [[Primitive ventricle]]: The initial stage of the development of the ventricle in the heart.<br />
* [[Primitive heart tube]]: The earliest stage of heart development in the embryo, from which the primitive atrium originates.<br />
* [[Atrium (heart)]]: The two upper chambers of the heart, which receive blood from the veins and pump it to the ventricles.<br />
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==See also==<br />
* [[Heart development]]<br />
* [[Embryology]]<br />
* [[Cardiac anatomy]]<br />
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[[Category:Embryology]]<br />
[[Category:Cardiology]]<br />
[[Category:Anatomy]]<br />
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