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Superior vena cava: Wikis

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Vein: {{{Name}}}
Right ventricle Left ventricle Aortic valve Mitral valve Left atrium Right atrium Aorta Pulmonary valve Tricuspid valve Inferior vena cava Superior vena cava Pulmonary artery Pulmonary vein Diagram of the human heart (cropped).svg
About this image
Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow.
Venenwinkel.png
Veins
Latin v. cava superior
Gray's subject #172 666
Source brachiocephalic vein, azygous vein
Precursor common cardinal veins
MeSH Vena+Cava,+Superior

The 'superior vena cava''''(also known as the Precava) is a large diameter, yet short vein that carries deoxygenated blood from the upper half of the body to the heart's right atrium.

It is formed by the left and right brachiocephalic veins, (also referred to as the innominate veins) which also receive blood from the upper limbs and the head and neck, behind the lower border of the first right costal cartilage. The azygous vein (which receives blood from the rib cage) joins it just before it enters the right atrium, at the upper right front portion of the heart. It is also known as the cranial vena cava in animals.

No valve separates the superior vena cava from the right atrium. As a result, the (right) atrial and (right) ventricular contractions are conducted up into the internal jugular vein and, through the sternocleidomastoid muscle, can be seen as the jugular venous pressure. In tricuspid valve regurgitation, these pulsations are very strong.

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