The superior and inferiorvenaecavae carry relatively deoxygenated blood from the upper and lower systemic circulations, respectively.
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This arch of the azygos vein ("arcusvenaeazygos") is an important anatomic landmark.
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Increasing the heart rate serves to decrease the pressure in the superior and inferiorvenaecavae by drawing more blood out of the right atrium.
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It is accompanied byvenaecomitantes (accompanying veins).
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In the right atrium, the stretch receptors occur at the junction of thevenaecavae.
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In mammals, it exists distinctly only in the embryonic heart (where it is found between the twovenaecavae); in nonmammalian chordates, however, the sinus venosus persists in the adult.
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